MCC Duct Factory Catalog

5/26/2018 MCC Duct Factory Catalog

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v e n t i l a t i o n s y s t e m s

PRODUCTS CATALOGUE

MCI(cover)final.indd 1 10/22/2013 5:


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A. MCC Company Prole

B. Mission & Vision Statement

C. Rectangular Ducts & Fittings

D. Rectangular Ducts Technical Guidelines

E. Spiral Ducts & Round Fittings

F. Fire Rated Ducts

G. Aluminum Pre Insulated Ducts

H. Technical Data & Useful Notes

Contents


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MCC Duct factory is the manufacturing arm of Modern Contracting Co., locatedin Riyadh with over twelve years of experience as HVAC ductwork manufacturer

and HVAC contractor.

Our management and technical team has a vast experience in the eld of

ductwork manufacturing and HVAC contracting.

Our Riyadh factory produces the following products in accordance with the

relevant international industry standards such as ASHRAE, SMACNA & DW:

Rectangular Ductwork and ttings.

Plenum boxes for Air outlets. Spiral Ductwork and Round ttings.

Rectangular Aluminum pre-insulated duct.

MCC offers a full range of additional & special products such as Ductwork

accessories (Fire Dampers, Fire Smoke Dampers, Access Doors, Volume

Dampers, VAV Boxes, Silencers and Air Devices), Fire Rated Duct.

COMPANYPROFILE


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Mission StatementOur mission is to provide our community with

an established dependable company to work

with for their HVAC comfort needs. We pledge

to help our employees to excell and succeed

in delivering a positive experience for the team

member and the customer. Success is the

result of clear, concise, positive and cooperative

thinking of all team members for the common

goal of excellence.

Vision StatementOur vision is to become the premier supplier of

air distribution products in the Kingdom of Saudi

Arabia and the GCC countries. We are committed

to service our community with excellence as a

team to our highest potential, personally and

professionally for the greatest integrity and

concern of all.

Missionand

VisionState

ment


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Rectangular

ducts and ttings

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Technical Information

About the System

We present you a production range ofrectangular ducts and ttings

The catalogue includes rectangular ducts and

ttings with dimensions as required by the

standard: SMACNA (metal and exible) or

DW144 and all standards referenced therein.

They are used in low and medium pressure

building ventilation and air-conditioning

systems. Stainless steel or aluminum ducts

and ttings can be fabricated on request where

better protection against corrosion is needed.

We also offer unusual ttings, not included in

the catalogue, based on your drawing.

Dimensions

The normal dimension, which is conventionally

used to identify and calculates straight ducts

and ttings, corresponds to the internal

dimensions of sides W and H, where W

stands for the width and H for the height.

Dimension L represents the useful length of

the straight duct, i.e. a dimension that affects

the total length of the duct system. Dimension

L represents the useful length of the tting, i.e.

a dimension that affects the total length of the

duct system.

Dimensions of rectangular ducts and ttings

are treated as standard from 130 mm to 2500

mm size of any side. Ducts and ttings with a

smaller or larger size in relation to the stated

objects to a special order. Imposition of the

entire surface, and the term of the contract

shall be determined on an individual basis.

Design

The rectangular ducts and ttings aredesigned with slip-t connections, either

welded or button punched. The rectangular

components can be made of other materials

such as stainless steel, aluminum or black

steel sheet.

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Duct

RSD

DescriptionOn its ends the rectangular ducts has plain

edges for slip connection or mounting frames

with sheet metal joining proles and is

stiffened with transverse sheet corrugation. In

addition, depending on its size, it is stiffened

with galvanised rods. For the purpose

of production, transport and installation

standardization, the ducts are fabricated in

maximum standard length of 1,200 mm.

Example Identifcation

F Flanged connectionS Slip connection

GI Galvanised material

SS Stainless Steel

BS Black Steel

ALU Aluminum

W width

H height

L length

Dimensions

The duct can be supplied as follows:

1. Single wall metal duct

2. Internally lined duct with plain facing

or perforated sheet on top of lining

complete with insulation guard and

insulation pins.

3. Double wall factory insulated duct

with inner and outer sheet metal and

insulation.

W

W

H

H

L L

product code RSD F GI - 500 X 300 - 1200

type

F

S

W

H

L

GISS

BS

ALU



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Description

On its ends the 90 bend has either plain

end for slip connection or mounting frames

with sheet metal joining proles. Bends are

advisable for systems with low ow rates/

pressures and smaller side lengths.

A bend is usually used to divert the direction

of the duct system by 90 degrees without

changing the cross-section of the duct

Example Identifcationproduct code RMBF F GI - 500 X 300 - 120

type

F

S

W

H

r

GISS

BS

ALU

F Flanged Connection

S Slip Connection

GI Galvanised Material

SS Stainless Steel Material

ALU Aluminum Material

BS Black steel material

W width

H height

r radius

Bend

RMBF

W

W

H

H

H

H

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Description

On its ends the standard 90 bend has either

plain ends for slip connection or mounting

frames with sheet metal joining proles. Bends

are advisable for systems with high ow rates/

pressures and greater side lengths.



S Slip Connection

GI Galvanised MaterialSS Stainless Steel Material

ALU Aluminum Material

BS Black Steel Material

W width

H height

r radius

Radiused Bend

RBF

Dimensions

Description

A bend is usually used to divert the direction of

the duct system by an angle while maintaining

the cross-section of the duct.

W

H

H

H

product code RBF F GI - 500 X 300 - 30

type

F

S

W

H

r

GISS

BS

ALU



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Description

The Transition is used to change the cross

section of the duct system from rectangular

to round. The tting enables to design a

ventilation system with all dimensions freely

changeable and any offset in both directions.



S Slip Connection


SS Stainless steel material

ALU Aluminum material

BS Black Steel material

W width

H height

d diameter

Dimension

Rectangular-to-Round Transition

RRTF

W

W

H

H

d d

L

product code RRTF F GI - 500 X 300 200

type

F

S

W

H

d

GISS

BS

ALU

Transitions can be fabricated with both centric

and eccentric construction.

Transitions length L is determined by the

drawing and site conditions.

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DescriptionThe reducer is used for joining two rectangular

ducts with different dimensions. On its ends

it has either plain end for slip connection or

mounting frames with sheet metal joining

proles. It enables to design a ventilation

system by reducing its cross section

concentrically. The axes of both dimensions

match each other.

Example Identifcationproduct code RCRF F GI - 500 X 300 X 400 - 200

type

F

S

W

H

c

d

GISS

BS

ALU


S Slip ConnectionGI Galvanized material

SS Stainless steel material



W inlet width

H inlet height

c Outlet width

d Outlet height

Dimension

Reducer

RCRF

L

W

H

H

c

d

d

c

The reducer can be fabricated in eccentric

construction RERF.



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Description

The variable cross-section is used to bypass

any obstructions in the ventilation system while

changing the height of the duct, e.g. at duct

crossings. On its ends it has either plain end

for slip connection or mounting frames with

sheet metal joining proles. To ensure proper

ow, it is recommended to select appropriate

dimensions for length L and deviation e.

Example Identifcationproduct code ROF F GI - 500 X 300 X 400 - 200

type

F

S

a

b

e

L

GISS

BS

ALU

F Flanged connection

S Slip connection


SS Stainles Steel material



W width

H height

e Shift

L length

Dimension

Offset

ROF

H

W

L

H

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Description

On its ends the T-piece has either plain end for

slip connection or mounting frame with sheet

metal joining proles. The T-piece enables to

design a ventilation system with a 90 degree

tap and an outlet reduction. The inlet and

passage are xed.



S Slip Connection

GI galvanized material

SS Stainless Steel material


BS black steel material

W width

H height

L length

c outlet width

d outlet Height

e longitudinal outlet shift

f transverse outlet shift

T-piece with Rectangular Outlet

RTF

Dimension

H

L

W

c

product code RTF F GI - 500 X 300 - 600 - 250 - 20 - 20

type

F

S

W

H

L

d

e

f

GISS

BS

ALU



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Description

On its ends the twin bend has either plainends for slip connection or has mounting

frames with sheet metal joining proles. It

enables to design a ventilation system with

two taps directed any angle. Turning vanes

can be used.



S Slip Connection

GI galvanized materialSS Stainless Steel material


ALU aluminum material

W height

H width

c outlet height 1

d outlet height 2

e base height

Dimension

Twin Bend

RTBF

W

product code RTBF F GI - 500 X 300 - 300 - 200 - 100

type

F

S

W

H

c

d

e

GISS

BS

ALU

H

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Description

On its ends the R-Fitting piece has either

plain ends for slip connection or has mounting

frames with sheet metal joining prole. The

bend tap enables uniform air distribution with

turning vanes to prevent air whirls in the duct.


F Flange Connection

S Slip Connection

GI Galvanized material




H height

W width

c passage height

d outlet height

L length

R-Fitting

RRF

L L

W

H

H

product code RRF F GI - 500 X 300 - 300 - 200 - 600

type

F

S

W

H

c

d

L

GISS

BS

ALU



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Description

The end cap is intended for terminating ducts.

It is made of galvanised sheet metal the

ange is made of an end cover with sheet

metal joining proles.



S Slip ConnectionGI Galvanised material



ALU aluminum material

W width

H height

e extension (by defult, e = 30 mm)

Dimension

End Cap

RECF

W

H

W

H

product code RECF F GI - 500 X 300 - 30

type

F

S

W

H

e

GISS

BS

ALU

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Rectangular ducts

Technical Guidelines


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1

2

2

3

4

4

56 6 6 7

888

88

88

1112 13

14

15

FCU-42TX-036

500X200 500X200

BOD 2800

600X300

500X300

BOD 2800

BOD 2450

BOD 2450BOD 2450

BOD 2450

PB 300X300X30009

1010

10 10

1213

14

15

BOD 2450

BOD 2800 BOD 2800

Fabrication Procedure:

According to The Drawing / Take Off Provided by The Client, MCI Engineers The Start The Operation of Production

Following The Consequent Steps:

a) Shop Drawing to be Prepared.

b) Accurate B.O.Qs and work orders to be released

c) Fabrication Begins releasing the work order to CNC Plasma and CNC Autofold coil line

d) All Ductworks are Fabricated According to SMACNAor DW 142/144

e) Each Item to be Numbered On The Drawing Provided, Fabricated Items to be Labeled:

Each Label Shows The Project Name, Customer Name, Job Ref., Item Number, Item Description

(Straight Duct, Elbow, Tee Etc...), Size & Length, Thickness.

g) QA/QC to be Made For Each Item Before Collection (Delivery).

I - Rectangular Ducts:Fabrication Procedure


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I - Rectangular Ducts: - Slip & DriveLongitudinal seams - Slide-on Flange

- Companion Angle

Asper: - SMACNA (2nd Edition - 1995) See Pages 1.17/1.67/1.74

- SMACNA (3rd Edition - 2005) See Pages 2.10/2.113

- DW/144 See Page 20


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I - Rectangular Ducts: - Slip & Drive - Slide-on Flange

- Companion Angle

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.3/2.9/A.42/A.43

- SMACNA (3rd Edition - 2005) See Pages 4.3/4.9/4.12/4.13

- DW/144 See Pages 55/57


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- Companion Angle

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.8/2.9


- DW/144 See Page 55/58


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- Companion Angle

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.8/2.9/3.18

- SMACNA (3rd Edition - 2005) See Pages 3.36/4.8/4.9



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- Companion Angle

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.7

- SMACNA (3rd Edition - 2005) See Pages 4.7

- DW/144 See Page 52/55


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I - Rectangular Ducts: - Slip & DriveSplitter Damper - Slide-on Flange

- Companion Angle


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I - Rectangular Ducts: - Slip & DriveDuct Acoustic Liner - Slide-on Flange

- Companion Angle




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I - Rectangular Ducts:Plenum Box

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.20

- SMACNA (3rd Edition - 2005) See Pages 10.1


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I - Rectangular Ducts: - Slip & DriveAccessories - Slide-on Flange

- Companion Angle



- DW/142 See Page 28/31


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I - Rectangular Ducts:Accessories





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I - Rectangular Ducts:VENTO Accessories

(BEGIUM)


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I - Rectangular Ducts:Ductwork Construction Schedule - Table 1A / 1B / 1C - 1

Asper: - SMACNA (3rd Edition - 2005 Table 2.2) See Pages 2.16


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Asper: - SMACNA (3rd Edition - 2005 Table 2-3) See Pages 2.18


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Asper: - SMACNA (3rd Edition - 2005 Table 2-4) See Pages 2.20


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Asper: - SMACNA (3rd Edition - 2005 Table 2-5) See Page 2.22


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I - Rectangular Ducts:Ductwork Construction Schedule - Table 5A / 5B / 5C

- 500 Pa

Asper: - DW/142 See Page 18



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- 1000 Pa




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- 2000 Pa



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II - Rectangular Ducts WeldedLongitudinal Seams & Connections


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II - Rectangular Ducts Welded

Asper: - SMACNA (2nd Edition - 1995) See Pages 2.3/2.9/A.42/A.43



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Asper: - SMACNA (2nd Edition - 1995) See Page 2.7



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II - Rectangular Ducts WeldedTables: - Coating Mass (Weight)

- Galvanized Thicknesses

- Weight of Galvanized Steel

Asper: - DW/144 See Pages 93/97/98

Weight of Galvanized Steel

ThicknessWeight per

Square meter

mm

0.5

0.6

0.8

1.0

1.2

1.6

Kg

4.42

5.64

6.86

8.08

10.52

12.96


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A1

B1

AB

L2

L1

A

B

L

B

A

L2

L1

B

A L

A

B

L

L2

A3

B3

B1

B2

A2

A1

L1

L3

AREA = 2 (A +B) L

STRAIGHT DUCT

REDUCER

RECTANGULAR TO ROUND TRANSITION

AREA = 2 (A +B) L

AREA = 2 (A +B) L

ELBOW

AREA = 2 (A +B) (L1 + L2)

OFFSET

AREA = 2 (A +B) (L1 + L2)

TEE

AREA = 2 (A1 +B1) L1

+ 2 (A2 +B2) L2

+ 2 (A3 +B3) L3

SURFACE AREA CALCULATION


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Spiral Ducts

and Round Fittings


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Single Wall


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Single Wall


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Double Wall


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Double Wall


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Fire Rated

Ducts

FireRatedD

ucts


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FIRE RESISTANT DUCTWORK SYSTEMS


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COMPANY PROFILE

Firemac was established in 1989 and has grown to become amajor provider of passive fire protection products, both in the UKand internationally.

Passive fire protection (PFP) is a key part of the structural integrityand fire safety in a building. Passive fire protection contains orslows the spread of a fire through the use of fire-resistant ductwork,walls, floors, and doors.

Firemac has been at the forefront in product design for the PFPsector for over 20 years, and has extensive experience advising a

broad range of clients on solution selection through to designingand installing ductwork protection systems, fire walls and ceilings,and fire resistant services enclosures.

Firemacs market leading product range for ductwork - FiremacFM60, Firemac FM120 and Firemac FM240 - has a proven trackrecord in builds both in the UK, and increasingly in internationalmarkets. More recently, Firemac has introduced FM Blue an im-pact resistant, steel-faced board that can be used to form fire re-sisting walls, ceilings and enclosures.

As our customers would expect of a company working in safetycritical systems Firemac is ISO 9001 registered and Third PartyAccredited.

01

Firemac FM Ductwork Systems are in place acrossmany builds in the UK and internationally, includingthe redevelopment of Terminal 2 at Heathrow Airport,London

Firemac FM Blue has beenincorporated in a number ofmajor civil engineering projectsincluding Crossrail, Europe'sbiggest construction project.


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02

FIREMAC FM60 / FM120 / FM240 DUCTWORK SYSTEMS

Building Regulations require that new buildings must be divided into firecompartments in order that the spread of fire in the building is contained. Thereare obvious areas of weakness which include doors, building services andventilation ductwork passing from one compartment to another. In particular thestandard ventilation ductwork system offers little or no protection against firespread, and to overcome this fire resistant ductwork is used.

Firemac FM ductwork systems gives ductworkers complete control of both

fabrication and installation of fire resistant ducts where required in commercialdevelopments.

Firemacs FM systems have beendesigned around the needs ofductworkers, allowing them tomanufacture fire resistantductwork in their own factories

without the need for third partysuppliers.

Using Firemacs FM systems putsall elements of a contract in thehands of the ductworker, andallows entry into a specialist andlucrative market segment, withoutthe need to develop highlyexpensive in house systems.

Full training in the fabrication offire resistant ductwork is given,and as part of Firemacs service

commitment we work with ourcustomers as the ductworkerstechnical support department.Firemac can deal directly with

specifiers and consultants on anyqueries relating to fire protection,whether at the tender, fabrication,install or sign off stage.

The National Museum of Scotland, first opened in 1866, has undergone a

complete renovation at a cost of 47.5m. Firemac FM Ductwork Systems havebeen installed in the new restaurant in the Museum, which welcomed over 1.4mvisitors last year


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03

PRODUCT DESCRIPTION

Firemac FM Ductwork Systems use a flexible glass fibre fabric, bonded both physically and mechanically onto the ductto give the required fire rating. The fabric material is only 1mm thick and adds virtually nothing to the overall weight of theduct.

The fabric is silver grey in appearance, unobtrusive and gives a neat, aesthetically pleasing finish. During the finishingprocess the fabric is overprinted with FIRE RATED to ensure it remains independent of standard ventilation ductworkand service trays.

Ductwork is made in the normal manner, broadly following the requirements of DW144 / SMACNA, and there is usuallyno requirement to upgrade the gauge of steel used to achieve the required fire resistance. Once the duct has been

fabricated the fabric is applied quickly and easily, and bonded to the duct using a contact adhesive. The fabric ismechanically fixed using mild steel rivets or screws along a single longitudinal edge. Flanges are then tapped on andfixed mechanically to the duct - no curing time is required and the duct is then ready to ship to site for installation.

TESTING AND THIRD PARTY CERTIFICATION

With standard ventilation ductwork offering limitedprotection against fire spread it is an easy way forfire and smoke to spread rapidly through abuilding, penetrating fire compartment walls andfloors and cutting off means of escape. Thereforeit is critical that any safety critical product isrigorously tested.

Firemac FM systems have been tested andassessed to BS476, Part 24, and demonstratedfire resistance of up to four hours. A full appraisalof Firemac FM duct systems, which includes asummary of the supporting test evidence, hasbeen issue by the Building ResearchEstablishment (BRE) and is available on request.

Independent inspection of Firemac FM DuctworkSystems has been carried out by IFC, a UKAS

accredited and internationally recognised providerof Third Party Certification.


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04

FIREMAC SYSTEMS: YOUR PARTNER FOR FIRE RESISTANT DUCTWORK

For companies who have not installed fire rated ductwork before, or have limited experience, initial entry into this marketcan seem daunting. As it is a safety critical area of the industry, the technical knowledge required can be off putting.

Firemac acts as your in-house technical department, and will answer any questions you or a consultant has regardingfire rated ductwork, and the performance of Firemac's range of systems. Our technical team include some of the UKsleading experts on passive fire protection and Firemac's systems have been designed to be a straightforward addition tothe range of services you offer.

BENEFITS FOR DUCTWORKERS

The process of becoming a Firemac installer is simple and involves no set up costs, or licencing agreement.

Using Firemac systems allows a ductworker to bring all aspects of a project under their control without the need to outsourceto third party contractors.

The benefits of using Firemacs range of ductwork systems include:

l System proven in UK and Middle East in a number of high profile builds

l The fabric is applied by ductworkers themselves, quickly and easily, with minimum wastage, and at the point offabrication, giving them complete control of the whole contract, without the need to resort to any third partysuppliers for fire rated ductwork.

l There is no loss of time on site, continuity is guaranteed and any plan changes are easily accomplished.

l Cuts out the need to develop costly in-house systemsl Allows the ductworker to build a reputation for fire resistant ductworkl Full training given at customers premises

l Complete technical back up and site sign offl The fabric itself is extremely strong, while its flexibility means it is easy to apply, usually by one worker.l No curing time is required, meaning that fire resisting ductwork can be built, delivered and installed within hours.

l There is usually no need to upgrade the duct to achieve the required fire resistance.


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05

TRAINING AND ONGOING SUPPORT

All of Firemacs customers receive full training prior to the fabrication or installation of fire resistant ductwork. The trainingpackage is delivered at the customers factory and is a combination of technical presentations, training videos and handson manufacture if fire resistant ductwork.

At the completion of the training each company is certificated as an Accredited Installer. An annual training refresher isalso given and any changes to the Technical Manual is communicated directly to the customer.

Each customer is listed on www.firemac.com and can access their own secure area of the website where the trainingpackages are hosted. Completed projects and photographs can be listed within the customers details on the website, al-lowing them to build a portfolio of successful projects and a reputation for the manufacture and installation of fire resist-ant ductwork.

Firemac recognises that specifiers and building control officers can interpret the requirements around the installation of

fire resistant ductwork in different ways. We will work directly with specifiers and other key influencers to ensure anytechnical submission meets their requirements, and become our customers in house technical department.

Firemac inspectors will visit the instalation of the ductwork on site to ensure it is fitted to the requirements of the Techni-cal Manual, and issue a Certificate of Conformity in the name of the ductworker.

FIREMAC TRAINING PACKAGE

The training is a mixture of presentations, videoand hands on fabrication designed to give ourcustomers an introduction into the purpose andrequirements of fire resistant ductwork.

The training will include the fabrication of standardfire resistant ductwork, flanges and mechanicalfixings, transitions and bends, patches, accesspanels and installation.


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APPLICATIONS

Suitable for a wide range of environments, Firemacs fireresistant ductwork has been successfully installed infactories, commercial kitchens, schools, hospitals, shoppingcentres and a wide range of other projects for the purposesof safeguarding life and property from fire.

Firemac fire resisting ductwork can be used in any area of abuilding to protect life and property and to aid the emergencyservices in the event of a fire. Typical areas include:

l Ventilation Ductworkl Smoke Extract Ductwork Systemsl Non Domestic Kitchen Extract Ductwork

l Basement and Enclosed Car Park Duct Systemsl Escape Route Ductsl Pressurisation Ductwork Systemsl Basement Smoke Extract Systemsl Dual Ventilation / Smoke Extract Systemsl Fume Cupboard Extract Systemsl High Risk Areas

BENEFITS FOR SPECIFIERS

The fabric itself is extremely strong, while its flexibility means it is easy to apply, usually by one worker. It is applied afterthe duct has been manufactured by a combination of adhesive and mechanical fixings - no curing time is required,meaning that fire resisting ductwork can be built, delivered and installed within hours without the need to use any thirdparty contractors. This ensures any plan amendments can be easily and quickly accommodated, without any loss oftime on site. There is usually no need to upgrade the duct to achieve the required fire rating.

l Proven track record in major buildsl Industry leading technical expertise in passive fire protectionl Tested to British and European standardsl Fire resistance from 1-4 hoursl No need to upgrade ductwork or hangers reducing time, wastage and costl Delivered on site, fire rated and ready to installl No requirements for second tradesl Firemac is a ISO 9001 accredited company


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UK PROJECTS

Firemacs range of systems have been successfully installed in a range of builds including schools and universities,restaurants, shopping complexes, hospitals, offices and other commercial developments

Recent customers include a wide range of blue chip private sector organisations including Holiday Inn, Marks andSpencer, Premier Inn, Burger King, Wagamama, TGI Friday, Easy Jet, Tesco Bank, Next, Boots, Debenhams and ASDA.

Public sector clients include a number of NHS Hospital Trusts, universities, schools and colleges, the MOD and theNuclear Decommissioning Authority.

An up to date list of recent projects is available at www.firemac.com

07

UK EXHIBITIONS

Firemac has attended a number of UK basedexhibitions including Firex International in order topromote the brand to specifiers and otherinfluencers.


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08

INTERNATIONAL PROJECTS

Firemac has partnerships in a number of international markets in the Middle East and Southern Asia, includingMalaysia, India, UAE, Qatar and Saudi Arabia. In each market Firemacs range of products complies with local CivilDefence requirements.

As in the UK full training is given to Firemacs international partners alongside ongoing technical and sales support.

Hamad Medical City inDoha, Qatar, is a worldclass medical facility.

The project is spreadover 500,000 squaremetres and comprisesthree hospitals with atotal bed capacity of1,100. It is the secondlargest healthcaredevelopment in theMiddle East.

When completed over25,000 square metres ofFiremac FM DuctworkSystems will form anintegral part of thebuildings fire protection.

INTERNATIONAL EXHIBITIONS

Firemac also exhibits alongside our partners at the key tradeshows in the region, including The Big 5 series ofconstruction exhibitions and Project Qatar.

This allows Firemac to meet key buyers and specifiers withour partners, promote the range of products and answer anytechnical queries.


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reInsulated

Ducts

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Pre Insulated

Ducts


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Technical Data &

Useful Notes


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Face Velocity,

fpm

Louvers

Intake

1. 7000 cfm and greater 400

2. 2000 to 7000 cfm 250 to 400

Exhaust

1. 5000 cfm and greater 500

2. Less than 5000 cfm 300 to 400

Filters

Panel filters

1. Viscous impingement 200 to 800

2. Dry-type extended-surface

Flat (low-efficiency) Duct velocity

P leated medi a (medi um effi ciency) up to 750

HEPA 250

Renewable media filters1. Moving-curtain viscous impingement 500

2. Moving-curtain dry-media 200

Electronic air cleaners, ionizing-type 150 to 350

Heating coils

Steam and hot water 400 to 600

(200 min., 1500

max.)

Dehumidifying coils 500 to 600

Air washers

Spray type 300 to 700

High-velocity spray type 1200 to 1800

Duct element

es gn e oc es or r- an ng ys em

Components

Source: ASHRAE Handbook 1989, Fundamentals

Main Ducts Supply Return Supply Return

Residences 600 1000 800 600 600

Apartments

Hotel Bedrooms

Hospital Bedrooms

Private Offices

Directors Rooms

Libraries

Theaters

Auditoriums

General OfficesHigh Class Restaurants

High Class Stores

Banks

Average Stores

Cafeterias

Industrial 2500 3000 1800 2200 1500

2000 1500 1600 1200

Recommended Maximum Duct Velocities for Low Velocity Systems (fpm)

1100 1000 800

2000 1500 1600 1200

1800

1500 1300 1200 1000

2000 1500 1600 1200

1300

1000

1200

800

1500

CONTROLLING FACTOR

NOISE GENERATIONAPPLICATION Main Ducts Branch Ducts

CONTROLLING FACTOR-DUCT FRICTION


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VELOCITY

PRESSURE (in.

w

VELOCITY

(fpm)

VELOCITY

PRESSURE (in.

w

VELOCITY

(fpm)

0.01 400 0.58 30500.02 565 0.60 3100

0.03 695 0.62 3150

0.04 800 0.64 3200

0.05 895 0.66 3250

0.06 980 0.68 3300

0.07 1060 0.70 3350

0.08 1135 0.72 3400

0.09 1200 0.74 3450

0.10 1265 0.76 3490

0.11 1330 0.78 3540

0.12 1385 0.80 3580

0.13 1445 0.82 3630

0.14 1500 0.84 3670

0.15 1550 0.86 3710

0.16 1600 0.88 3760

0.17 1650 0.90 38000.18 1700 0.92 3840

0.19 1745 0.94 3880

0.20 1790 0.96 3920

0.21 1835 0.98 3960

0.22 1880 1.00 4010

0.23 1920 1.04 4080

0.24 1960 1.08 4160

0.25 2005 1.12 4240

0.26 2040 1.16 4310

0.27 2080 1.20 4390

0.28 2120 1.24 4460

0.29 2160 1.28 4530

Velocity Pressures

0.30 2190 1.32 4600

0.31 2230 1.36 4670

0.32 2270 1.40 4740

0.33 2300 1.44 48100.34 2340 1.48 4870

0.35 2370 1.52 4940

0.36 2400 1.56 5000

0.37 2440 1.60 5070

0.38 2470 1.64 5130

0.39 2500 1.68 5190

0.40 2530 1.72 5250

0.41 2560 1.76 5310

0.42 2600 1.80 5370

0.43 2630 1.84 5430

0.44 2660 1.88 5490

0.45 2690 1.92 5550

0.46 2720 1.96 5610

0.47 2750 2.00 5660

0.48 2770 2.04 5720

0.49 2800 2.08 5780

0.50 2830 2.12 5830

0.51 2860 2.16 5890

0.52 2890 2.20 5940

0.53 2920 2.24 5990

0.54 2940 2.28 6050

0.55 2970

0.56 3000

NOTES: 1. Data for standard air (29.92 in. Hg and 70F)

2. Data derived from the following equation:

V = velocity in fpmwhere:

H = pressure difference

termed "velocity head" (in.


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6 6.6

8 7.6 8.7

10 8.4 9.8 10.9

12 9.1 10.7 12.0 13.1

14 9.8 11.5 12.9 14.2 15.3

16 10.4 12.2 13.7 15.1 16.4 17.5

18 11.0 12.9 14.5 16.0 17.3 18.5 19.7

20 11.5 13.5 15.2 16.8 18.2 19.5 20.7 21.9

22 12.0 14.1 15.9 17.6 19.1 20.4 21.7 22.9 24.0

24 12.4 14.6 16.5 18.3 19.9 21.3 22.7 23.9 25.1 26.2

26 12.8 15.1 17.1 19.0 20.6 22.1 23.5 24.9 26.1 27.3 28.4

28 13.2 15.6 17.7 19.6 21.3 22.9 24.4 25.8 27.1 28.3 29.5 30.6

30 13.6 16.1 18.3 20.2 22.0 23.7 25.2 26.6 28.0 29.3 30.5 31.7

32 14.0 16.5 18.8 20.8 22.7 24.4 26.0 27.5 28.9 30.2 31.5 32.7

34 14.4 17.0 19.3 21.4 23.3 25.1 26.7 28.3 29.7 31.1 32.4 33.7

36 14.7 17.4 19.8 21.9 23.9 25.7 27.4 29.0 30.5 32.0 33.3 34.6

38 15.0 17.8 20.2 22.4 24.5 26.4 28.1 29.8 31.3 32.8 34.2 35.6

40 15.3 18.2 20.7 22.9 25.0 27.0 28.8 30.5 32.1 33.6 35.1 36.4

42 15.6 18.5 21.1 23.4 25.6 27.6 29.4 31.2 32.8 34.4 35.9 37.344 15.9 18.9 21.5 23.9 26.1 28.1 30.0 31.8 33.5 35.1 36.7 38.1

46 16.2 19.3 21.9 24.4 26.6 28.7 30.6 32.5 34.2 35.9 37.4 38.9

48 16.5 19.6 22.3 24.8 27.1 29.2 31.2 33.1 34.9 36.6 38.2 39.7

50 16.8 19.9 22.7 25.2 27.6 29.8 31.8 33.7 35.5 37.2 38.9 40.5

52 17.1 20.2 23.1 25.7 28.0 30.3 32.3 34.3 36.2 37.9 39.6 41.2

54 17.3 20.6 23.5 26.1 28.5 30.8 32.9 34.9 36.8 38.6 40.3 41.9

56 17.6 20.9 23.8 26.5 28.9 31.2 33.4 35.4 37.4 39.2 41.0 42.7

58 17.8 21.2 24.2 26.9 29.4 31.7 33.9 36.0 38.0 39.8 41.6 43.3

60 18.1 21.5 24.5 27.3 29.8 32.2 34.4 36.5 38.5 40.4 42.3 44.0

62 21.7 24.8 27.6 30.2 32.6 34.9 37.1 39.1 41.0 42.9 44.7

64 22.0 25.1 28.0 30.6 33.1 35.4 37.6 39.6 41.6 43.5 45.3

66 22.3 25.5 28.4 31.0 33.5 35.9 38.1 40.2 42.2 44.1 46.0

68 22.6 25.8 28.7 31.4 33.9 36.3 38.6 40.7 42.8 44.7 46.6

70 22.8 26.1 29.1 31.8 34.4 36.8 39.1 41.2 43.3 45.3 47.2

72 23.1 26.4 29.4 32.2 34.8 37.2 39.5 41.7 43.8 45.8 47.8

74 23.3 26.7 29.7 32.5 35.2 37.7 40.0 42.2 44.4 46.4 48.4

76 23.6 27.0 30.0 32.9 35.6 38.1 40.5 42.7 44.9 47.0 48.9

78 23.8 27.3 30.4 33.3 36.0 38.5 40.9 43.2 45.4 47.5 49.5

80 24.1 27.5 30.7 33.6 36.3 38.9 41.4 43.7 45.9 48.0 50.182 27.8 31.0 33.9 36.7 39.3 41.8 44.1 46.4 48.5 50.6

84 31.3 34.3 37.1 39.7 42.2 44.6 46.9 49.0 51.1

86 31.6 34.6 37.4 40.1 42.6 45.0 47.3 49.6 51.7

88 31.9 34.9 37.8 40.5 43.1 45.5 47.8 50.0 52.2

90 32.2 35.3 38.2 40.9 43.5 45.9 48.3 50.5 52.7

92 32.5 35.6 38.5 41.3 43.9 46.4 48.7 51.0 53.2

94 32.8 35.9 38.8 41.6 44.3 46.8 49.2 51.5 53.7

96 33.0 36.2 39.2 42.0 44.7 47.2 49.6 52.0 54.2

98 33.3 36.5 39.5 42.4 45.0 47.6 50.1 52.4 54.7

100 36.8 39.8 42.7 45.4 48.0 50.5 52.9 55.2

102 37.1 40.2 43.1 45.8 48.4 50.9 53.3 55.6

104 37.4 40.5 43.4 46.2 48.8 51.3 53.8 56.1

106 37.7 40.8 43.7 46.5 49.2 51.7 54.2 56.6

108 38.0 41.1 44.1 46.9 49.6 52.2 54.6 57.0

110 38.3 41.4 44.4 47.3 50.0 52.6 55.1 57.5

112 41.7 44.7 47.6 50.3 53.0 55.5 57.9

114 42.0 45.1 48.0 50.7 53.4 55.9 58.3

116 42.3 45.4 48.3 51.1 53.7 56.3 58.8

118 42.6 45.7 48.6 51.4 54.1 56.7 59.2120 42.9 46.0 49.0 51.8 54.5 57.1 59.6

122 43.2 46.3 49.3 52.2 54.9 57.5 60.0

124 43.5 46.6 49.6 52.5 55.3 57.9 60.4

126 43.8 46.9 50.0 52.9 55.6 58.3 60.9

128 44.0 47.3 50.3 53.2 56.0 58.7 61.3

130 47.5 50.6 53.5 56.4 59.1 61.7

132 47.8 50.9 53.9 56.7 59.4 62.1

134 48.1 51.2 54.2 57.1 59.8 62.4

136 48.4 51.6 54.5 57.4 60.2 62.8

138 48.7 51.9 54.9 57.8 60.5 63.2

140 49.0 52.2 55.2 58.1 60.9 63.6

142 49.3 52.5 55.5 58.4 61.3 64.0

144 49.6 52.8 55.8 58.8 61.6 64.3a

Table based on De= 1.3[(ab)0.625

/(a+b)0.250

] Length adjacent side of rectangular duct (b), in.

Circular Equivalents of Rectangular Duct for Equal Friction and Capacitya

Length of One Side of Rectangular Duct (a), inches

6 8 10 12 14 16 18 20 22 24 26 28

Circular Duct Diameter, inches

Lgth

Adj.b


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30 32.8

32 33.9 35.0

34 34.9 36.1 37.2

36 35.9 37.1 38.2 39.4

38 36.8 38.1 39.3 40.4 41.5

40 37.8 39.0 40.3 41.5 42.6 43.7

42 38.7 40.0 41.3 42.5 43.7 44.8 45.9

44 39.5 40.9 42.2 43.5 44.7 45.8 47.0 48.1

46 40.4 41.8 43.1 44.4 45.7 46.9 48.0 49.2 50.3

48 41.2 42.6 44.0 45.3 46.6 47.9 49.1 50.2 51.4 52.5

50 42.0 43.5 44.9 46.2 47.5 48.8 50.0 51.2 52.4 53.6 54.7

52 42.8 44.3 45.7 47.1 48.4 49.7 51.0 52.2 53.4 54.6 55.7 56.8

54 43.5 45.1 46.5 48.0 49.3 50.7 52.0 53.2 54.4 55.6 56.8 57.9

56 44.3 45.8 47.3 48.8 50.2 51.6 52.9 54.2 55.4 56.6 57.8 59.0

58 45.0 46.6 48.1 49.6 51.0 52.4 53.8 55.1 56.4 57.6 58.8 60.0

60 45.7 47.3 48.9 50.4 51.9 53.3 54.7 56.0 57.3 58.6 59.8 61.0

62 46.4 48.0 49.6 51.2 52.7 54.1 55.5 56.9 58.2 59.5 60.8 62.0

64 47.1 48.7 50.4 51.9 53.5 54.9 56.4 57.8 59.1 60.4 61.7 63.0

66 47.7 49.4 51.1 52.7 54.2 55.7 57.2 58.6 60.0 61.3 62.6 63.968 48.4 50.1 51.8 53.4 55.0 56.5 58.0 59.4 60.8 62.2 63.6 64.9

70 49.0 50.8 52.5 54.1 55.7 57.3 58.8 60.3 61.7 63.1 64.4 65.8

72 49.6 51.4 53.2 54.8 56.5 58.0 59.6 61.1 62.5 63.9 65.3 66.7

74 50.3 52.1 53.8 55.5 57.2 58.8 60.3 61.9 63.3 64.8 66.2 67.5

76 50.9 52.7 54.5 56.2 57.9 59.5 61.1 62.6 64.1 65.6 67.0 68.4

78 51.4 53.3 55.1 56.9 58.6 60.2 61.8 63.4 64.9 66.4 67.9 69.3

80 52.0 53.9 55.8 57.5 59.3 60.9 62.6 64.1 65.7 67.2 68.7 70.1

82 52.6 54.5 56.4 58.2 59.9 61.6 63.3 64.9 66.5 68.0 69.5 70.9

84 53.2 55.1 57.0 58.8 60.6 62.3 64.0 65.6 67.2 68.7 70.3 71.7

86 53.7 55.7 57.6 59.4 61.2 63.0 64.7 66.3 67.9 69.5 71.0 72.5

88 54.3 56.3 58.2 60.1 61.9 63.6 65.4 67.0 68.7 70.2 71.8 73.3

90 54.8 56.8 58.8 60.7 62.5 64.3 66.0 67.7 69.4 71.0 72.6 74.1

92 55.3 57.4 59.3 61.3 63.1 64.9 66.7 68.4 70.1 71.7 73.3 74.9

94 55.8 57.9 59.9 61.9 63.7 65.6 67.3 69.1 70.8 72.4 74.0 75.6

96 56.4 58.4 60.5 62.4 64.3 66.2 68.0 69.7 71.5 73.1 74.8 76.3

98 56.9 59.0 61.0 63.0 64.9 66.8 68.6 70.4 72.1 73.8 75.5 77.1

100 57.4 59.5 61.6 63.6 65.5 67.4 69.2 71.0 72.8 74.5 76.2 77.8

102 57.9 60.0 62.1 64.1 66.1 68.0 69.9 71.7 73.4 75.2 76.9 78.5

104 58.3 60.5 62.6 64.7 66.7 68.6 70.5 72.3 74.1 75.8 77.5 79.2106 58.8 61.0 63.2 65.2 67.2 69.2 71.1 72.9 74.7 76.5 78.2 79.9

108 59.3 61.5 63.7 65.8 67.8 69.8 71.7 73.5 75.4 77.1 78.9 80.6

110 59.8 62.0 64.2 66.3 68.3 70.3 72.3 74.1 76.0 77.8 79.5 81.3

112 60.2 62.5 64.7 66.8 68.9 70.9 72.8 74.7 76.6 78.4 80.2 81.9

114 60.7 63.0 65.2 67.3 69.4 71.4 73.4 75.3 77.2 79.1 80.8 82.6

116 61.1 63.4 65.7 67.8 69.9 72.0 74.0 75.9 77.8 79.7 81.5 83.3

118 61.6 63.9 66.2 68.3 70.5 72.5 74.5 76.5 78.4 80.3 82.1 83.9

120 62.0 64.4 66.6 68.8 71.0 73.1 75.1 77.1 79.0 80.9 82.7 84.5

122 62.5 64.8 67.1 69.3 71.5 73.6 75.6 77.6 79.6 81.5 83.3 85.2

124 62.9 65.3 67.6 69.8 72.0 74.1 76.2 78.2 80.2 82.1 84.0 85.8

126 63.3 65.7 68.0 70.3 72.5 74.6 76.7 78.7 80.7 82.7 84.6 86.4

128 63.8 66.2 68.5 70.8 73.0 75.1 77.2 79.3 81.3 83.2 85.2 87.0

130 64.2 66.6 69.0 71.3 73.5 75.7 77.8 79.8 81.8 83.8 85.7 87.6

132 64.6 67.0 69.4 71.7 74.0 76.2 78.3 80.4 82.4 84.4 86.3 88.2

134 65.0 67.5 69.9 72.2 74.5 76.7 78.8 80.9 82.9 84.9 86.9 88.8

136 65.4 67.9 70.3 72.6 74.9 77.1 79.3 81.4 83.5 85.5 87.5 89.4

138 65.8 68.3 70.7 73.1 75.4 77.6 79.8 81.9 84.0 86.1 88.0 90.0

140 66.2 68.7 71.2 73.6 75.9 78.1 80.3 82.5 84.6 86.6 88.6 90.6

142 66.6 69.1 71.6 74.0 76.3 78.6 80.8 83.0 85.1 87.1 89.2 91.1144 67.0 69.5 72.0 74.4 76.8 79.1 81.3 83.5 85.6 87.7 89.7 91.7

aTable based on De= 1.3[(ab)

0.625/(a+b)

0.250] Length adjacent side of rectangular duct (b), in.

Circular Equivalents of Rectangular Duct for Equal Friction and Capacitya(Cont.)

Lgth

Adj.b


4230 32 34 36 38 40 46 48 50 52


44


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36

38

40

42

44

46

48

50

52

54 59.0

56 60.1 61.2

58 61.2 62.3 63.4

60 62.2 63.4 64.5 65.6

62 63.2 64.4 65.5 66.7

64 64.2 65.4 66.6 67.7 70.0

66 65.2 66.4 67.6 68.8 71.0

68 66.1 67.4 68.6 69.8 72.1 74.3

70 67.1 68.3 69.6 70.8 73.2 75.4

72 68.0 69.3 70.5 71.8 74.2 76.5 78.774 68.9 70.2 71.5 72.7 75.2 77.5 79.8

76 69.8 71.1 72.4 73.7 76.2 78.6 80.9 83.1

78 70.6 72.0 73.3 74.6 77.1 79.6 81.9 84.2

80 71.5 72.9 74.2 75.5 78.1 80.6 82.9 85.2 87.5

82 72.3 73.7 75.1 76.4 79.0 81.5 84.0 86.3 88.5

84 73.2 74.6 76.0 77.3 80.0 82.5 85.0 87.3 89.6 91.8

86 74.0 75.4 76.8 78.2 80.9 83.5 85.9 88.3 90.7 92.9

88 74.8 76.3 77.7 79.1 81.8 84.4 86.9 89.3 91.7 94.0 96.2

90 75.6 77.1 78.5 79.9 82.7 85.3 87.9 90.3 92.7 95.0 97.3

92 76.4 77.9 79.3 80.8 83.5 86.2 88.8 91.3 93.7 96.1 98.4 100.6

94 77.1 78.7 80.1 81.6 84.4 87.1 89.7 92.3 94.7 97.1 99.4 101.7

96 77.9 79.4 80.9 82.4 85.3 88.0 90.7 93.2 95.7 98.1 100.5 102.7

98 78.7 80.2 81.7 83.2 86.1 88.9 91.6 94.2 96.7 99.1 101.5 103.8

100 79.4 81.0 82.5 84.0 86.9 89.7 92.4 95.1 97.6 100.1 102.5 104.8

102 80.1 81.7 83.3 84.8 87.7 90.6 93.3 96.0 98.6 101.1 103.5 105.9

104 80.8 82.4 84.0 85.6 88.5 91.4 94.2 96.9 99.5 102.0 104.5 106.9

106 81.6 83.2 84.8 86.3 89.3 92.2 95.1 97.8 100.4 103.0 105.5 107.9

108 82.3 83.9 85.5 87.1 90.1 93.1 95.9 98.7 101.3 103.9 106.4 108.9

110 83.0 84.6 86.2 87.8 90.9 93.9 96.7 99.5 102.2 104.8 107.4 109.9112 8 3.6 85.3 86.9 88.5 91.7 94.7 97.6 100.4 103.1 105.8 108.3 110.8

114 84.3 86.0 87.7 89.3 92.4 95.5 98.4 101.2 104.0 106.7 109.3 111.8

116 8 5.0 86.7 88.4 90.0 93.2 96.2 99.2 102.1 104.9 107.6 110.2 112.7

118 85.7 87.4 89.1 90.7 93.9 97.0 100.0 102.9 105.7 108.4 111.1 113.7

120 86.3 88.0 89.7 91.4 94.6 97.8 100.8 103.7 106.6 109.3 112.0 114.6

122 87.0 88.7 90.4 92.1 95.4 98.5 101.6 104.5 107.4 110.2 112.9 115.5

124 87.6 89.4 91.1 92.8 96.1 99.3 102.4 105.3 108.2 111.0 113.8 116.4

126 88.2 90.0 91.8 93.5 96.8 100.0 103.1 106.1 109.1 111.9 114.6 117.3

128 88.9 90.6 92.4 94.1 97.5 100.7 103.9 106.9 109.9 112.7 115.5 118.2

130 89.5 91.3 93.1 94.8 98.2 101.5 104.6 107.7 110.7 113.6 116.4 119.1

132 90.1 91.9 93.7 95.5 98.9 102.2 105.4 108.5 111.5 114.4 117.2 120.0

134 90.7 92.5 94.3 96.1 99.6 102.9 106.1 109.2 112.3 115.2 118.1 120.8

136 91.3 93.2 95.0 96.8 100.2 103.6 106.8 110.0 113.0 116.0 118.9 121.7

138 91.9 93.8 95.6 97.4 100.9 104.3 107.6 110.7 113.8 116.8 119.7 122.5

140 92.5 94.4 96.2 98.0 101.6 105.0 108.3 111.5 114.6 117.6 120.5 123.4

142 93.1 95.0 96.8 98.7 102.2 105.7 109.0 112.2 115.3 118.4 121.3 124.2

144 93.6 95.6 97.4 99.3 102.9 106.3 109.7 112.9 116.1 119.2 122.1 125.0a

Table based on De= 1.3[(ab)0.625

/(a+b)0.250

] Length adjacent side of rectangular duct (b), in.

Circular Equivalents of Rectangular Duct for Equal Friction and Capacitya(Cont.)

Lgth

Adj.b


54


76 80 84 88 9256 58 60 64 68 72


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Friction Loss Chart for Round Duct


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FRICTION OF ROUND DUCT SYSTEM ELEMENTS


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FRICTION OF RECTANGULAR DUCT SYSTEM ELEMENTS


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FRICTION OF RECTANGULAR DUCT SYSTEM ELEMENTS (Cont)


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FRICTION OF ROUND ELBOWS


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FRICTION OF RECTANGULAR ELBOWS


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FRICTION OF RECTANGULAR ELBOWS(Cont)


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USEFUL FORMULAS

1. Airside System Equa onHS= 1.08 x CFM x THS= 1.1 x CFM x T

HL= 0.68 x CFM X WGR.

HL= 4840 x CFM X WLB.

HT= 4.5 x CFM X h

HT= HS+ HL

SHR = HS =

HS

HT HS+ HL

HS = Sensible Heat (Btu/hr.)

HL = Latent Heat (Btu/hr.)

HT = Total Heat (Btu/hr.)

T = Temperature Difference (F)

WGR.= Humidity Ra o Difference (Gr.H2O/lbs.DA)

WLB.= Humidity Ra o Difference (lbs.H2O/lbs.DA)

h = Enthalpy Difference (Btu/lbs.DA)

CFM = Air Flow Rate (Cubic Feet per Minute)

SHR = Sensible Heat Ra o

m = Mass flow (lbs.DA/hr.)

DA = Dry Air

2. Air Change Rate Equa onsAC

= CFM x 60

HR VOLUME

CFM = (AC/HR) x VOLUME

60

AC/HR = Air Change Rate per Hour

CFM = Air Flow Rate (Cubic Feet per Minute)

VOLUME = Space Volume (Cubic Feet)

3. Fan LawsCFM2 = RPM2

CFM1 RPM1

SP2 = CFM22 = RPM2

2

SP1 CFM1 RPM1

BHP2 = CFM23 = RPM2

3 = SP2

1.5

BHP1 CFM1 RPM1 SP1


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Cont. Useful Formulas

BHP = CFM x SP x SP.GR.

6356 x FANEFF.

MHP = BHP

M / DEFF.

CFM = Cubic Feet/Minute Air Density = Constant

RPM = Revolutions/Minute SP.GR.(Air) = 1.0

SP = in. W.G. FANEFF = 65-85%

BHP = Break Horsepower M/DEFF = 80-95%

Fan Size = Constant M/D = Motor/Drive

4. Ductwork EquationsTP = SP + VP

VP = V2

4005

V = Q = Q x 144

A W x H

DBQ = 1.3 x (A x B)0.625

(A + B)0.25

TP = Total Pressure

SP = Static Pressure, Friction Losses

VP = Velocity, ft./min.

Q = Flow through Duct, CFM

A = Area of Duct, sq.ft.

W = Width of Duct, in.

H = Height of Duct, in.

DBQ = Equivalent Round Duct Size for Rectangular Duct, in.

A = One Dimension of Rectangular Duct, in.

B = Adjacent Side of Rectangular Duct, in.


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To convert From To Multiply by

Length In. m 0.0254

Length Ft m 0.3048

Length m In. 39.3701

Length m Ft 3.28084

Area In. m 0.00064516

Area Ft m 0.092903

Area m In. 1550

Area m Ft 10.7639

To convert From To Multiply by

Velocity Ft/min M/s 0.00508Velocity M/s Ft/min 196.850

Pressure Psi Pa 6894.76

Pressure Ft of water Pa 2988.98

Pressure In. of water Pa 249.082

Pressure Pa Psi 0.000145038

Pressure Pa Ft of water 0.000334562

Pressure Pa In. of water 0.00401474

Flow Rate Cfm L/s 0.4719

Flow Rate Cfm m/s 0.000471947

Flow Rate Gpm L/s 0.0630902

Flow Rate m/s Cfm 2118.88

Flow Rate L/s Cfm 2.1191

Flow Rate L/s Gpm 15.8503

Conversions of length and Area

Conversions of velocity, pressure, and flow rate


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Modern Contracting Co.

P.O. Box 9677 - Riyadh 11423

Tel.: (011) 4653234 - Fax: 4658566

Email: [email protected]

MCC Duct Factory Catalog

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Transcript of MCC Duct Factory Catalog