CURTAIN TYPE FIRE DAMPERS

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Definition of a Fire Damper:The National Fire Protection Association (NFPA) Standard 90A defines a fire damper as "a device, installed inan air distribution system, that is designed to close automatically upon detection of heat, to interrupt migratoryairflow, and to restrict the passage of flame."

Although curtain fire dampers restrict flame and airflow passage as described in the NFPA definition, they arevirtually transparent to heat and therefore ineffective for use in openings in fire-rated ceiling assemblies. SeeCeiling Damper Basics, on page C30, for more details.

Types of Curtain Fire DampersCurtain type fire dampers are generally available in three configuration as follows:

TYPE 'A' TYPE 'B' TYPE 'C'

Openings in vertical fire separations ie: walls and partitions, require a vertical mount fire damper (duct runshorizontally). Gravity causes the blades to drop closed (static rated dampers).Openings in horizontal fire separations ie: floors, require a horizontal mount fire damper (duct runs vertically).Horizontal mount fire dampers utilize springs to pull the blades closed.Dynamic rated fire dampers utilize closure springs in both vertical and horizontal applications to ensure theblades close fully under airflow conditions.

Static Rated vs. Dynamic Rated Fire Dampers:Static fire dampers were designed for use in HVAC systems that shut down (fans off) in the event of a firealarm. They have not been tested to ensure closure while air is moving in the duct.Dynamic fire dampers have been tested under specific airflow and static pressure conditions in order toensure that the damper will close in today’s HVAC designs that utilize 'fans on' smoke management systems.See Dynamic Fire Damper Selection Procedures in this section.Generally, a dynamic rated damper can be used in both static (fans off) or dynamic (fans on) type systems, buta static rated fire damper can only be used in a 'static' system (fans shut down during alarm).

Did You Know?....• Fire dampers must be mounted in a steel sleeve. The damper/sleeve assembly is held in place in the wall,

partition or floor by use of retaining angles on each side of the wall etc. Ductwork shall connect to the sleeveon either side, as required, providing a connection that can 'break away' should the ductwork fall during a fire.This allows the damper/sleeve assembly to remain in the wall etc., maintaining the integrity of the fire barrier.

• NFPA 90A requires that fire barriers of less than 3 hours utilize a 1 1/2 hour rated fire damper. Fire barriers of3 hours or more require a 3 hour rated fire damper.

• All fire dampers must be installed as per manufacturer’s instructions.

Blades and frame in the airstream. Blades out of the airstream; With bladesout of airstream, provides better freearea and resulting pressure dropcharacteristics than Type 'A', especiallyon smaller size dampers.

Blades and frame out of the airstream;used mainly for transitioning to round oroval duct. Provides optimum pressuredrop characteristics with blades andframe out of airstream.

H

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D W

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Curtain Fire Damper Basics

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DYNAMIC FIRE DAMPERS • SELECTION PROCEDURE

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Underwriters Laboratories Inc. Standard for Safety UL 555 evaluates fire dampers for use as either: (A) Fire dampersfor static systems – for HVAC systems that are automatically shut down in the event of a fire or for air transfer openingsin walls or partitions; (B) Fire dampers for dynamic systems – for HVAC systems that are operated in the event of a fire.Dynamic Fire Dampers are therefore required to close under airflow.All fire dampers must be labeled to indicate if they are to be used in static or dynamic systems. For dynamic rateddampers, this label must also indicate the maximum rated velocity through the open damper, and the maximumpressure differential across the closed damper.To attain approval for use in a dynamic system, UL Standard 555 requires that test dampers close three times (manuallyreleased) against their rated flow and shut-off pressure at ambient air temperature before heat is introduced to causethe fusible link to melt and close the damper one final time.All Manufactured Air Products dynamic curtain type fire dampers have been tested to 2000 fpm (10.16 m/s) and 4" w.g.(1 kPa) static pressure.

EXAMPLE #1: SINGLE SECTION FIRE DAMPERTo determine the maximum allowable airflow through the following damper:Type A damper 24" x 24". The maximum rated velocity is 2000 fpm. 24" x 24" is 4 sq. ft. (Width in inches x Height in inches dividedby 144 = sq. ft.), therefore, maximum allowable airflow is 2000 fpm x 4 sq. ft. = 8,000 cfm.

Check the maximum system pressure that could occur against a closed damper. Manufactured Air Products dynamic fire dampershave been tested and are rated to close against 4" w.g.

36" (914)

32"(813)

EXAMPLE #2: MULTIPLE SECTION FIRE DAMPERTo determine the maximum allowable airflow through the following multi-section damper assembly: Type A damper 36" x 32" opening (the assembly will consist of four 18" x 16" dampers); The maximum rated velocity is 2000 fpm.36" x 32" is 8 sq. ft., therefore, 2000 fpm x 8 sq. ft. = 16000 cfm. This is the maximum allowable airflow that may be passed throughthe 36" x 32" opening.

Check the maximum system pressure that could occur against a closed damper. Manufactured Air Products dynamic fire dampershave been tested and are rated to close against 4" w.g.

24" (610)

24"(610)

Selection Procedure For Dynamic Fire Dampers

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CURTAIN TYPE FIRE DAMPERS

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MINIMUM AND MAXIMUM UL CLASSIFIED SIZES

Damper Types: Type A: Blades and frame in airstream. Type B: Blades out of airstream for minimal restriction of airflow. Type CR: Round enclosure withblades and frame out of airstream for maximum free area. Type CO: Oval enclosure with blades and frame out of airstream for maximum free area. Type CSR: Square or rectangular enclosure with blades and frame out of airstream for maximum free area.

Maximum individual sections not to exceed 18" x 24" (457 x 610).Maximum individual sections not to exceed 34" x 60" (864 x 1524).

SERIES/MODEL TYPE

DYNA

MIC

STAT

IC

Dynamic/Static Curtain Type Fire Dampers

12

1

2

SINGLE SECTION MULTIPLE SECTION ASSEMBLY

MINIMUM SIZE MAXIMUM SIZE MAXIMUM SIZEINSTALLATION INSTALLATION INSTALLATION

VERTICAL HORIZONTAL VERTICAL HORIZONTAL VERTICAL HORIZONTAL

6" x 6" 6" x 6" 24" x 24" 24" x 24" 72" x 24" or 36" x 48"FDDA A(152 x 152) (152 x 152) (610 x 610) (610 x 610) (1829 x 610 or 914 x 1219)

Contact Factory

6" x 4" 6" x 4" 24" x 21" 24" x 21" 72" x 21" or 36" x 45"FDDB B(152 x 102) (152 x 102) (610 x 533) (610 x 533) (1829 x 533 or 914 x 1143) Contact Factory

FDDC Round CR 4" dia. (102) 4" dia. (102) 20" dia. (508) 20" dia. (508) 34" dia. (864)

5" x 4" 5" x 4" 22" x 20" 22" x 20" 70" x 20"FDDC Oval CO(127 x 102) (127 x 102) (559 x 508) (559 x 508) (1778 x 508)

Contact Factory

4" x 4" 4" x 4" 22" x 20" 22" x 20" 70" x 20"FDDC Sq./Rect.CSR(102 x 102) (102 x 102) (559 x 508) (559 x 508) (1778 x 508)

FDDA-12/14/16 A6" x 6" 6" x 6" 24" x 24" 24" x 24"

(152 x 152) (152 x 152) (610 x 610) (610 x 610)— —

6" x 4" 6" x 4" 24" x 21" 24" x 21"FDDB-12/14/16 B(127 x 102) (127 x 102) (559 x 508) (559 x 508)

— —

FDDC-12/14/16 CR 4" dia. (102) 4" dia. (102) 20" dia. (508) 20" dia. (508) — —

FDA A 4" x 4" 4" x 4" 60" x 60" 60" x 60" 120" x 120" 102" x 60"(102 x 102) (102 x 102) (1524 x 1524) (1524 x 1524) (3048 x 3048) (2591 x 1524)

FDB B 4" x 3" 4" x 4" 60" x 54" 60" x 54" 120" x 114" 102" x 54"(102 x 76) (102 x 102) (1524 x 1372) (1524 x 1372) (3048 x 2896) (2591 x 1372)

FDC Round CR 3" dia. (76) 4" dia. (102) 53" dia. (1346) 53" dia. (1346) 112" dia. (2845) 53" dia. (1346)

FDC Oval CO 4" x 3" 5" x 4" 58" x 53" 58" x 53" 118" x 112" 100" x 53"(102 x 76) (127 x 102) (1473 x 1346) (1473 x 1346) (2997 x 2845) (2540 x 1346)

FDC Sq./Rect. CSR 3" x 3" 4" x 4" 58" x 53" 58" x 53" 118" x 112" 100" x 53"(76 x 76) (102 x 102) (1473 x 1346) (1473 x 1346) (2997 x 2845) (2540 x 1346)

FDA-12/14/16 A 4" x 4" 4" x 4" 48" x 48" 48" x 48"— —(102 x 102) (102 x 102) (1219 x 1219) (1219 x 1219)

FDB-12/14/16 B 4" x 3" 4" x 4" 48" x 43" 48" x 43"— —(102 x 76) (102 x 102) (1219 x 1092) (1219 x 1092)

FDC-12/14/16 CR 3" dia. (76) 4" dia. (102) 42" dia. (1067) 42" dia. (1067) — —

FDTA A4" x 4" 4" x 4" 41" x 36" or 36" x 60" 41" x 36" — —(102 x 102) (102 x 102) (1041 x 914) or (1041 x 914)

(914 x 1524)

FDTB B4" x 3" 4" x 3" 41" x 30" or 36" x 50" 41" x 30" — —(102 x 76) (102 x 76) (1041 x 762) or (1041 x 762)

(914 x 1270)

FDTC Round CR 3" dia. (76) 3" dia. (76) 34" dia. (864) 34" dia. (864) — —

FDTC Oval CO 4" x 3" 4" x 3" 39" x 29" 39" x 29" — —(102 x 76) (102 x 76) (991 x 737) (991 x 737)

FDTC Sq./Rect.CSR3" x 3" 3" x 3" 39" x 29" or 34" x 49" 39" x 29" — —(76 x 76) (76 x 76) (991 x 737) or (991 x 737)

(864 x 1245)

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DYNAMIC FIRE DAMPERS • 1 1/2 HOUR

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• STANDARD FRAME• FOR USE IN DYNAMIC

SYSTEMS• 1 1/2 HOUR RATING• UL 555 CLASSIFIED

Models: FDDA Type AFDDB Type BFDDC Type CR/COFDDC Type CSR

CONSTRUCTION DETAILS:

UL LISTEDFUSIBLE LINK

(REPLACEABLE)

3" (76)

STAINLESS STEELCLOSURE SPRING

CURTAIN BLADELOCKING RAMP

VERTICAL MOUNT

TYPE A: MODEL D0110

HEI

GH

T =

NO

MIN

ALD

UC

T SI

ZE -

1/4"

(6)

INTERLOCKINGCURTAIN BLADES

HORIZONTAL MOUNT



WIDTH = NOMINALDUCT SIZE - 1/4" (6)

4 1/4"

(108)

ROLL-FORMEDFRAME

4 1/4" (108)

DU

CT

SIZE

- 1/

4" (6

)

Model FDDA

Horizontal Mount

Vertical Mount

Type A: Model FDDA

The MAP FDD Series dynamic curtain fire dampers are UL/ULC approved for use where building codes require protection of HVACductwork penetrations in walls, partitions or floors that have a fire resistance rating of 2 hours or less. Classified for use in dynamicsystems (max. 2000 fpm @ 4" w.g.) where the HVAC system remains operative in the event of a fire, the FDD Series featuresstainless steel closure springs for assured damper closure under airflow, corrosion resistant steel frame and blades for lastingperformance, and choice of transition styles.

FDDA FDDB FDDC FDDC(Type A) (Type B) (Type CR/CO) (Type CSR)

FRAME: 4 1/4" (108) wide, 4 1/4" (108) wide, 4 1/4" (108) wide, 4 1/4" (108) wide,

22 ga. (0.85) roll- 22 ga. (0.85) roll- 22 ga. (0.85) roll- 22 ga. (0.85) roll-formed G60 formed G60 formed G60 formed G60

galvanized steel galvanized steel galvanized steel; galvanized steel;out of airstream out of airstream

BLADES: Curtain type, inter- Out of airstream. Out of airstream. Out of airstream.locking blades, 22 ga. Curtain type, inter- Curtain type, inter- Curtain type, inter-

(0.85) roll-formed locking blades, 22 ga. locking blades, 22 ga. locking blades, 22 ga.G60 galvanized (0.85) roll-formed (0.85) roll-formed (0.85) roll-formed

steel G60 galvanized G60 galvanized G60 galvanized steel steel steel

ENCLOSURE: Type B Type C Type CN/A 22 ga. (.085) Round or Oval Square or Rect.

galvanized steel 22 ga. (.085) 22 ga. (.085)galvanized steel galvanized steel

FUSIBLE LINK: 165°F (74°C) Std. 165°F (74°C) Std. 165°F (74°C) Std. 165°F (74°C) Std.(UL Listed) 212°F (100°C) 212°F (100°C) 212°F (100°C) 212°F (100°C)

available available available available

BLADE Stainless steel Stainless steel Stainless steel Stainless steelCLOSURE: closure springs closure springs closure springs closure springs

and galvanized and galvanized and galvanized and galvanizedsteel locking ramps steel locking ramps steel locking ramps steel locking ramps

MOUNTING: Vertical Vertical Vertical Verticalor or or or

Horizontal Horizontal Horizontal Horizontal

AVAILABLE Galvanized steel; Galvanized steel; Galvanized steel; Galvanized steel;SLEEVE: Specify SL Specify SL Specify SL Specify SL

Option Option Option Option

For MIN./MAX. UL SIZES see chart on page C11.

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For overall damper dimensions see sizing chart on page C22.

PERFORMANCE DATA:Curtain type fire dampers impose minimal resistance to air flow in the system. The following charts indicate both free areafor the different damper types and static pressure losses for various velocities.

HOW TO SPECIFY

Type B: Model FDDB

Type CR: Model FDDC

Type CO: Model FDDC

Type CSR With Collar(Standard):

Model FDDC

Type CSR Without Collar:

Model FDDC

H =DUCT SIZE

+ 1/8" (3)

W = DUCT SIZE - 1/4" (6)

HH

W + 1 3/4" (44)

WW + 1 3/4" (44)

W

D + 1 3/4" (44)

D W + 1 3/4" (44)

WH

1"

TYPE B DAMPER FREE AREA TYPE B DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

6 12 18 24 30 36 42 48 54 60 (152) (305) (457) (610) (762) (914) (1067) (1219)(1372) (1524)

6 (152) .17 .39 .62 .84 1.1 1.3 1.5 1.7 2.0 2.212 (305) .36 .83 1.3 1.8 2.3 2.7 3.2 3.7 4.1 4.618 (457) .54 1.3 2.0 2.7 3.4 4.2 4.9 5.6 6.3 7.124 (610) .73 1.7 2.7 3.7 4.6 5.6 6.6 7.5 8.5 9.530 (762) .92 2.1 3.4 4.6 5.8 7.0 8.3 9.5 10.7 11.936 (914) 1.1 2.6 4.1 5.5 7.0 8.5 9.9 11.4 12.9 14.442 (1067) 1.3 3.0 4.7 6.5 8.2 9.9 11.6 13.4 15.1 16.848 (1219) 1.5 3.5 5.4 7.4 9.4 11.4 13.3 15.3 17.3 19.2

54 (1372) 1.7 3.9 6.1 8.3 10.6 12.8 15.0 17.2 19.5 21.7

TYPE A DAMPER FREE AREA TYPE A DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

6 12 18 24 30 36 42 48 54 60 (152) (305) (457) (610) (762) (914) (1067) (1219)(1372) (1524)

6 (152) .14 .33 .52 .70 .89 1.1 1.3 1.5 1.7 1.812 (305) .31 .72 1.1 1.5 1.9 2.4 2.8 3.2 3.6 4.018 (457) .48 1.1 1.7 2.4 3.0 3.7 4.3 4.9 5.6 6.224 (610) .65 1.5 2.4 3.2 4.1 5.0 5.8 6.7 7.5 8.430 (762) .82 1.9 3.0 4.1 5.2 6.3 7.3 8.4 9.5 10.636 (914) .99 2.3 3.6 4.9 6.3 7.6 8.9 10.2 11.5 12.842 (1067) 1.2 2.7 4.2 5.8 7.3 8.8 10.4 11.9 13.4 15.048 (1219) 1.3 3.1 4.9 6.6 8.4 10.2 11.9 13.7 15.5 17.2

54 (1372) 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.4

60 (1524) 1.7 3.9 6.1 8.3 10.6 12.8 15.0 17.2 19.4 21.7

To determine pressure drop across opendamper, calculate free area velocity asshown, find velocity on curve and readacross for s.p. differential.

Free Area Velocity (fpm) =

Example: 1-36" x 24" Damper required for8,500 cfm. (Type A)

FAV = 85005 sq. ft.

= 1700 fpm

1700 fpm located on the ‘A’ curve shows apressure drop of .07 in. wg.

cfm = cubic feet per minutefpm = feet per minute velocityS.P. = static pressure in inches water gaugeFAV = Free Area Velocity

Imperial System ShownTo convert to SI (metric) system:

Multiply cfm by .4719 for liters per secondfpm by .00508 for meters per secondin. wg. by .2486 for kilopascalssq. ft. by .0929 for square meters

cfmFree Area

.40

.02

.03

.04

.05

.06

.07

.08

.09

.20

.50

.60

.70

.80

.901.0

.30

.10

.01

600

700

800

900

1000

1500

2000

3000

4000

5000

Free Area VFree Area Velocity (fpm)elocity (fpm)

FREE AREA VELOCITYFREE AREA VELOCITYV.S. ST.S. STATIC PRESSURE DROPTIC PRESSURE DROP

Static Static Pressure Pressure Drop Drop (in. wg.)(in. wg.)

TYPE 'A'TYPE 'A'

TYPE 'B'TYPE 'B'

TYPE 'C'TYPE 'C'

TYPE C DAMPERS HAVE FREE AREA EQUAL TONOMINAL DUCT AREA.

To calculate Free Area of round duct: DIAMETER2 x .00545 = Free Area (sq ft.)

SUGGESTED SPECIFICATION:Provide and install, as shown on plans and as described in specifications, Dynamic rated fire dampers as manufactured byManufactured Air Products, meeting or exceeding the following criteria: Fire dampers shall meet the requirements of NFPA 90Aand shall be manufactured, tested and labeled in accordance with UL 555 Safety Standard for Fire Dampers - Sixth Edition,June 1999, including Dynamic Closure Test (formerly the Operation Test). Dampers shall be classified for dynamic closureagainst an airflow velocity of 2000 fpm (10.16 m/s) at 4" w.g. (1 kPa) static pressure differential (across closed damper).Each fire damper shall bear a UL 1 1/2 hour fire resistance rating label in addition to label verifying the airflow and closurepressure ratings as established by the Dynamic Closure Test. Each fire damper shall also be marked with the words "For usein dynamic systems". Dampers marked "For use in static systems only" are not acceptable.Each fire damper shall be complete with a 165°F (74°C) UL Listed fusible link. Fire dampers shall each include a steel sleeve ofappropriate length/gauge and retaining angles, supplied by damper manufacturer to ensure proper installation in accordance withdamper manufacturer’s instructions. Contractor shall provide and install an access door at each fire damper, of appropriate size toallow for inspection, testing and fusible link replacement. Data submitted for approval shall include confirmation of UL qualificationsin addition to manufacturer’s installation instructions. Each shipment of fire dampers shall include same installation instructions.Dynamic rated fire dampers shall be Manufactured Air Products Models FDDA (Type A), FDDB (Type B), FDDC (Type C).

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INTEGRAL SLEEVE DYNAMIC FIRE DAMPERS (1 1/2 HOUR LISTING)

FOR USE IN DYNAMIC SYSTEMS.MAP integral sleeve fire dampers ensure proper damper mounting in sleeve and can be shipped direct tojob site for immediate installation, eliminating costly and inconvenient shop handling. All units areconstructed with 22 ga. (0.85) roll-formed G60 galvanized steel integral sleeve available in 12" (305), 14"(356) or 16" (406) length. Optional 'Quick-Set' retaining angles are available to complete the installationpackage.

Type 'A' – Blades and frame in the airstream.Model: FDDAMin. size - 6" x 6" (152 x 152)Max. size - 24" x 24" (610 x 610)

Type 'CR' – Round transition collars. Blades partially in airstreamModel: FDDCMin. size - 4" dia. (102)Max. size - 20" dia. (508)

Type 'B' – Blades out of airstream.Model: FDDBMin. size - 6" x 4" (152 x 102)Max. size - 24" x 21" (610 x 533)

W

H

LW

H

A

L

D +2"

(51)

1"(25)

D + 2" (51)

D

L

TYPE A: MODEL FDDA - 12/14/16 TYPE B: MODEL FDDB - 12/14/16

TYPE CR: MODEL FDDC - 12/14/16CONSTRUCTION DETAILS:

INTEGRALSLEEVE/FRAME: 22 ga. (0.85) roll-formed G60 galvanized steel.

FDDxx -12 Length 12" (305)FDDxx -14 Length 14" (356)FDDxx -16 Length 16" (406)

BLADES: Curtain type interlocking blades, 22 ga. (0.85)roll-formed G60 galvanized steel.

FUSIBLE LINK: 165°F (74°C) standard. UL Listed. 212°F (100°C) available.

BLADECLOSURE: Vertical and Horizontal mount.Stainless steel closure springs and galvanized steellocking ramps.

Damper Height (H) Dim. 'A'5" thru 17" (127 thru 432) 2" (51)18" thru 21" (457 thru 533) 3" (76)

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HOW TO SPECIFY

Intergral Sleeve Dynamic Fire Dampers

Models: FDDA - 12/14/16FDDB - 12/14/16FDDC - 12/14/16

SUGGESTED SPECIFICATION:Provide and install, as shown on plans and as described in specifications, Dynamic rated fire dampers as manufactured byManufactured Air Products, meeting or exceeding the following criteria: Fire dampers shall meet the requirements of NFPA 90Aand shall be manufactured, tested and labeled in accordance with UL 555 Safety Standard for Fire Dampers - Sixth Edition,June 1999, including Dynamic Closure Test (formerly the Operation Test). Dampers shall be classified for dynamic closureagainst an airflow velocity of 2000 fpm (10.16 m/s) at 4" w.g. (1 kPa) static pressure differential (across closed damper).Each fire damper shall bear a UL 1 1/2 hour fire resistance rating label in addition to label verifying the airflow and closurepressure ratings as established by the Dynamic Closure Test. Each fire damper shall also be marked with the words "For usein dynamic systems". Dampers marked "For use in static systems only" are not acceptable.Each fire damper shall be complete with a 165°F (74°C) UL Listed fusible link. In addition, each fire damper shall be providedfrom the factory in an integral 22 ga. (0.85) galvanized steel sleeve of (specifier select one) 12" (305), 14" (356) or 16" (406)in length complete with Manufactured Air Products 'Quick-Set' retaining angles, to ensure proper installation in accordancewith damper manufacturer’s instructions. Contractor shall provide and install an access door at each fire damper, of appropriatesize to allow for inspection, testing and fusible link replacement. Data submitted for approval shall include confirmation of ULqualifications in addition to manufacturer’s installation instructions. Each shipment of fire dampers shall include sameinstallation instructions. Integral sleeve Dynamic rated fire dampers shall be Manufactured Air Products Models FDDA-12 or14 or 16 (Type A), FDDB-12 or 14 or 16 (Type B), FDDC-12 or 14 or 16 (Type C).

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STATIC FIRE DAMPERS • 1 1/2 HOUR

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• STANDARD FRAME• FOR USE IN STATIC

SYSTEMS• 1 1/2 HOUR RATING• UL 555 CLASSIFIED

Models: FDA Type AFDB Type BFDC Type C

Model FDA

The MAP FD Series curtain fire dampers, for use in static "fans off" systems where the HVAC system shuts down in the event ofa fire, are UL/ULC approved to provide protection of HVAC ductwork penetrations in walls, partitions or floors that have a fireresistance rating of 2 hours or less. The FD Series features corrosion resistant steel frame and blades for performance that lasts,and a choice of transition styles and factory installed sleeves to suit duct size, making installation fast and simple.

FDA FDB FDC(Type A) (Type B) (Type C)

FRAME: 4 1/4" (108) wide, 4 1/4" (108) wide, 4 1/4" (108) wide,22 ga. (0.85) roll- 22 ga. (0.85) roll- 22 ga. (0.85) roll-

formed G60 formed G60 formed G60galvanized steel galvanized steel galvanized steel;

out of airstream

BLADES: Curtain type, inter- Out of airstream. Out of airstream.locking blades, 22 ga. Curtain type, inter- Curtain type, inter-

(0.85) roll-formed locking blades, 22 ga. locking blades, 22 ga.G60 galvanized (0.85) roll-formed (0.85) roll-formed

steel G60 galvanized G60 galvanizedsteel steel

ENCLOSURE: Type B Type C

N/A 22 ga. (.085) Round or Ovalgalvanized steel 22 ga. (.085)

galvanized steel

FUSIBLE LINK: 165°F (74°C) Std. 165°F (74°C) Std. 165°F (74°C) Std.(UL Listed) 212°F (100°C) 212°F (100°C) 212°F (100°C)

available available available

BLADE Vertical mount; gravity Vertical mount; gravity Vertical mount; gravityCLOSURE: Horizontal mount; Horizontal mount; Horizontal mount;

stainless steel closure stainless steel closure stainless steel closuresprings with galvanized springs with galvanized springs with galvanized

steel locking ramps steel locking ramps steel locking ramps

MOUNTING: Vertical Vertical Verticalor or or

Horizontal Horizontal Horizontal

INTEGRALSLEEVE: See Model See Model See Model22 ga (.085) x12"(305) long FDAx-12 FDBx-12 FDCx-1222 ga (.085) x14"(356) long FDAx-14 FDBx-14 FDCx-1422 ga (.085) x16"(406) long FDAx-16 FDBx-16 FDCx-16


MODEL 0110V – VERTICAL MOUNT

TYPE A: MODEL 0110

HEIG

HT =

NOM

INAL

DUCT

SIZ

E - 1

/4" (

6)


3" (76)

MODEL 0110H – HORIZONTAL MOUNT




4 1/4"

(108)

ROLL-FORMEDFRAME


(REPLACEABLE)

4 1/4" (108)

DUCT

SIZ

E - 1

/4" (

6)

For MIN./MAX. UL SIZES see chart on page C11. Horizontal Mount

Vertical Mount

Type A: Model FDA

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TYPE B DAMPER FREE AREA TYPE B DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

6 12 18 24 30 36 42 48 54 60 (152) (305) (457) (610) (762) (914) (1067) (1219)(1372) (1524)

6 (152) .17 .39 .62 .84 1.1 1.3 1.5 1.7 2.0 2.212 (305) .36 .83 1.3 1.8 2.3 2.7 3.2 3.7 4.1 4.618 (457) .54 1.3 2.0 2.7 3.4 4.2 4.9 5.6 6.3 7.124 (610) .73 1.7 2.7 3.7 4.6 5.6 6.6 7.5 8.5 9.530 (762) .92 2.1 3.4 4.6 5.8 7.0 8.3 9.5 10.7 11.936 (914) 1.1 2.6 4.1 5.5 7.0 8.5 9.9 11.4 12.9 14.442 (1067) 1.3 3.0 4.7 6.5 8.2 9.9 11.6 13.4 15.1 16.848 (1219) 1.5 3.5 5.4 7.4 9.4 11.4 13.3 15.3 17.3 19.2

54 (1372) 1.7 3.9 6.1 8.3 10.6 12.8 15.0 17.2 19.5 21.7

TYPE A DAMPER FREE AREA TYPE A DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

6 12 18 24 30 36 42 48 54 60 (152) (305) (457) (610) (762) (914) (1067) (1219)(1372) (1524)

6 (152) .14 .33 .52 .70 .89 1.1 1.3 1.5 1.7 1.812 (305) .31 .72 1.1 1.5 1.9 2.4 2.8 3.2 3.6 4.018 (457) .48 1.1 1.7 2.4 3.0 3.7 4.3 4.9 5.6 6.224 (610) .65 1.5 2.4 3.2 4.1 5.0 5.8 6.7 7.5 8.430 (762) .82 1.9 3.0 4.1 5.2 6.3 7.3 8.4 9.5 10.636 (914) .99 2.3 3.6 4.9 6.3 7.6 8.9 10.2 11.5 12.842 (1067) 1.2 2.7 4.2 5.8 7.3 8.8 10.4 11.9 13.4 15.048 (1219) 1.3 3.1 4.9 6.6 8.4 10.2 11.9 13.7 15.5 17.2

54 (1372) 1.5 3.5 5.5 7.5 9.5 11.5 13.5 15.5 17.5 19.4

60 (1524) 1.7 3.9 6.1 8.3 10.6 12.8 15.0 17.2 19.4 21.7



Example: 1-36” x 24” Damper required for8,500 cfm. (Type A)

FAV = 85005 sq. ft.

= 1700 fpm





cfmFree Area .40

.02

.03

.04

.05

.06

.07

.08

.09

.20

.50

.60

.70

.80

.901.0

.30

.10

.01

600

700

800

900

1000

1500

2000

3000

4000

5000




TYPE 'A'TYPE 'A'

TYPE 'B'TYPE 'B'

TYPE 'C'TYPE 'C'

PERFORMANCE DATA:Curtain type fire dampers impose minimal resistance to air flow in the system. The following charts indicate both freearea for the different damper types and static pressure losses for various velocities.

TYPE C DAMPERS HAVE FREE AREA EQUAL TO NOMINAL DUCT AREA.


HOW TO SPECIFY

Type B: Model FDB

Type CR: Model FDC

Type CO: Model FDC

Type CSR With Collar(Standard):Model FDC


Model FDC

H =DUCT SIZE

+ 1/8" (3)

W =DUCT SIZE - 1/4" (6)

HH

W + 1 3/4" (44)

WW + 1 3/4" (44)

W

D + 1 3/4" (44)

D W + 1 3/4" (44)

WH

1"

For overall damper dimensions see sizing chart on page C22.

SUGGESTED SPECIFICATION:Provide and install, as shown on plans and as described in specifications, fire dampers as manufactured by Manufactured AirProducts, meeting or exceeding the following criteria: Fire dampers shall be manufactured, tested and labeled in accordancewith UL 555 Safety Standard for Fire Dampers - Sixth Edition, June 1999, and shall have 1 1/2 hour fire resistance rating. Eachfire damper shall bear a UL label verifying fire resistance rating in addition to intended mounting position. Fire dampers shallbe suitably constructed for vertical or horizontal installation as required for each specific location.Each fire damper shall be complete with a (specifier select one) 165°F (74°C) or 212°F (100°C) UL Listed fusible link. Firedampers shall each include a steel sleeve of appropriate length/gauge and retaining angles, supplied by damper manufacturerto ensure proper installation in accordance with damper manufacturer’s instructions. Contractor shall provide and install anaccess door at each fire damper, of appropriate size to allow for inspection, testing and fusible link replacement. Informationsubmitted for approval shall include confirmation of UL qualifications, pressure drop data and manufacturer’s installationinstructions. Each shipment of fire dampers shall include same installation instructions. Fire dampers shall be ManufacturedAir Products Models FDA (Type A), FDB (Type B), FDC (Type C).

C18


C

DA

MPER

S

For Use in Static SystemsMAP integral sleeve fire dampers ensure proper damper mounting in sleeve and can be shipped direct to job site forimmediate installation, eliminating costly and inconvenient shop handling. All units are constructed with 22 ga. (0.85)roll-formed G60 galvanized steel integral sleeve available in 12" (305), 14" (356) or 16" (406) length. Optional 'Quick-Set' retaining angles are available to complete the installation package.

Type 'CR' – Round transition collars. Blades partially in airstream.

Models: FDCV Vertical and FDCH HorizontalMin. size - Vertical 3" dia. (76)

Horizontal 4" dia. (102)Max. size - Vertical or Horizontal 42" dia. (1067)

Type C: Model FDC - 12/14/16CONSTRUCTION DETAILS:

INTEGRALSLEEVE/FRAME: 22 ga. (0.85) roll-formed G60 galvanized steel.

FDxx -12 Length 12" (305)FDxx -14 Length 14" (356)FDxx -16 Length 16" (406)

BLADES: Curtain type interlocking blades, 22 ga. (0.85)roll-formed G60 galvanized steel.

FUSIBLE LINK: 165°F (74°C) standard. UL Listed. 212°F (100°C) available.

BLADECLOSURE: Vertical mount model; gravity.Horizontal mount models are equipped withstainless steel closure springs and galvanizedsteel locking ramps.

Type 'A' – Blades and frame in the airstream.Models: FDAV Vertical and FDAH HorizontalMin. size - Vertical or Horizontal 4" x 4" (102 x 102)Max. size -Vertical or Horizontal 48" x 48" (1219 x 1219)

Type 'B' – Blades out of airstream.Models: FDBV Vertical and FDBH HorizontalMin. size - Vertical 4" x 3" (102 x 76)

Horizontal 4" x 4" (102 x 102)Max. size -Vertical or Horizontal 48" x 43" (1219 x 1092)

Damper Height (H) Dim. 'A'5" thru 17" (127 thru 432) 2" (51)18" thru 27" (457 thru 686) 3" (76)28" thru 36"(711 thru 914) 4" (102)

37" thru 43" (940 thru 1092) 5" (127)

W

H

L

Type A: Model FDA - 12/14/16 Type B: Model FDB - 12/14/16

Integral Sleeve Static Fire Dampers (1 1/2 Hour Listing)

W

H

A

L

D +2"

(51)

1"(25)

D + 2" (51)

D

L

C19


C

DA

MPER

S

HOW TO SPECIFY

Integral Sleeve Static Fire Dampers

Models: FDAx - 12/14/16FDBx - 12/14/16FDCx - 12/14/16

SUGGESTED SPECIFICATION:Provide and install, as shown on plans and as described in specifications, integral sleeve fire dampers as manufactured byManufactured Air Products, meeting or exceeding the following criteria: Fire dampers shall be manufactured, tested andlabeled in accordance with UL 555 Safety Standard for Fire Dampers - Sixth Edition, June 1999, and shall have a 1 1/2 hourfire resistance rating. Each fire damper shall bear a UL label verifying fire resistance rating in addition to intended mountingposition. Fire dampers shall be suitably constructed for vertical or horizontal installation as required for each specific location.Each fire damper shall be complete with a (specifier select one) 165°F (74°C) or 212°F (100°C) UL Listed fusible link. Inaddition, each fire damper shall be provided from the factory in an integral 22 ga. (0.85) galvanized steel sleeve of (specifierselect one) 12" (305), 14" (356) or 16" (406) in length complete with Manufactured Air Products 'Quick-Set' retaining angles, toensure proper installation in accordance with damper manufacturer’s instructions. Contractor shall provide and install an accessdoor at each fire damper, of appropriate size to allow for inspection, testing and fusible link replacement. Information submittedfor approval shall include confirmation of UL qualifications, pressure drop data, and manufacturer’s installation instructions. Eachshipment of fire dampers shall include same installation instructions. Integral sleeve fire dampers shall be Manufactured AirProducts Models FDAx-12 or 14 or 16 (Type A), FDBx-12 or 14 or 16 (Type B), FDCx-12 or 14 or 16 (Type C).

C20

STATIC FIRE DAMPERS • THINLINE • 1 1/2 HOUR

C

DA

MPER

S

• THINLINE FRAME• FOR USE IN STATIC

SYSTEMS • 1 1/2 HOUR RATING• UL 555 CLASSIFIED

The MAP FDT Series Thinline curtain fire dampers are UL/ULC approved for use where building codes require the protection ofHVAC ductwork penetrations in walls, partitions or floors that have a fire resistance rating of 2 hours or less. The FDT Series isclassified for use only in static "fans off" systems where the HVAC system is automatically shut down in the event of a fire alarm.The FDT Series Thinline dampers are only 2" (51) deep making them ideal for installation in narrow fire rated partitions, transferduct openings, behind grilles or in any other application where space is limited. The FDT Series feature corrosion resistant steelframe and blades for lasting performance, and choice of transition styles and factory installed sleeves to suit duct size, makinginstallation fast and simple.

Models: FDTA Type AFDTB Type BFDTC Type C

FDTA FDTB FDTC(Type A) (Type B) (Type C)

FRAME: 2" (51) wide, 2" (51) wide, 2" (51) wide,22 ga. (0.85) roll- 22 ga. (0.85) roll- 22 ga. (0.85) roll-

formed G60 formed G60 formed G60galvanized steel galvanized steel galvanized steel;

out of airstream

BLADES: Curtain type, inter- Out of airstream. Out of airstream.locking blades, 22 ga. Curtain type, inter- Curtain type, inter-

(0.85) roll-formed locking blades, 22 ga. locking blades, 22 ga.G60 galvanized (0.85) roll-formed (0.85) roll-formed

steel G60 galvanized G60 galvanized steel steel

ENCLOSURE: Type B Type C N/A 22 ga. (.085) Round or Oval

galvanized steel 22 ga. (.085)galvanized steel

FUSIBLE LINK: 165°F (74°C) Std. 165°F (74°C) Std. 165°F (74°C) Std.(UL Listed) 212°F (100°C) 212°F (100°C) 212°F (100°C)

available available available

BLADE Vertical mount; gravity Vertical mount; gravity Vertical mount; gravityCLOSURE: Horizontal mount; Horizontal mount; Horizontal mount;

stainless steel closure stainless steel closure stainless steel closuresprings with galvanized springs with galvanized springs with galvanized

steel locking ramps steel locking ramps steel locking ramps

MOUNTING: Vertical Vertical Verticalor or or

Horizontal Horizontal Horizontal

AVAILABLE Galvanized steel; Galvanized steel; Galvanized steel;SLEEVE: Specify SL Specify SL Specify SL

Option Option Option


MODEL 0210V – VERTICAL MOUNT

TYPE A: MODEL 0210

HEIGHT =NOMINAL

DUCTSIZE -1/4" (6)


MODEL 0210H – HORIZONTAL MOUNT




2" (51)

ROLL-FORMEDFRAME


(REPLACEABLE)

DU

CT

SIZE

- 1/

4" (6

)

2" (51)

For MIN./MAX. UL SIZES see chart on page C11.

Model FDTA

Horizontal Mount

Vertical Mount

Type A: Model FDTA

C21

STATIC FIRE DAMPERS • THINLINE • 1 1/2 HOUR

C

DA

MPER

S


2" (51)

H =DUCTSIZE +1/8" (3) H

H

W + 1 3/4" (44)

WW + 1 3/4" (44)

W W + 1 3/4" (44)

WH

D + 1 3/4" (44)

D

1"

For overall damper dimensions, see sizing chart on page C23.

PERFORMANCE DATA:Curtain type fire dampers impose minimal resistance to air flow in the system. The following charts indicate both freearea for the different damper types and static pressure losses for various velocities.

TYPE A THINLINE DAMPER FREE AREA TYPE A THINLINE DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

6 12 18 24 30 36 40(152) (305) (457) (610) (762) (914) (1016)

6 (152) .12 .27 .44 .59 .75 .94 1.0212 (305) .27 .61 .93 1.36 1.7 2.1 2.418 (457) .42 .94 1.5 2.2 2.7 3.4 3.724 (610) .55 1.29 2.1 3.0 3.7 4.5 4.930 (762) .71 1.65 2.6 3.8 4.3 5.7 6.336 (914) .86 2.1 3.2 4.6 5.7 7.0 7.740 (1067) .93 2.3 3.5 5.1 6.3 7.6 8.848 (1219) 1.14 2.7 4.3 6.0 7.7 9.4

54 (1372) 1.32 3.1 4.9 6.9 8.8 10.7

60 (1524) 1.51 3.5 5.5 7.7 9.9 11.8

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

TYPE C DAMPERS HAVE FREE AREA EQUAL TO NOMINAL DUCT AREA.


TYPE B THINLINE DAMPER FREE AREA TYPE B THINLINE DAMPER FREE AREA – sq. ft. sq. ft. DUCT WIDTH in inches (mm)DUCT WIDTH in inches (mm)

DUCT

HEI

GHT

in in

ches

(mm

)DU

CT H

EIGH

T in

inch

es (m

m)

6 12 18 24 30 36 40(152) (305) (457) (610) (762) (914) (1016)

6 (152) .15 .32 .52 .69 .88 1.09 1.1712 (305) .31 .70 1.07 1.55 1.95 2.4 2.718 (457) .47 1.05 1.7 2.5 3.05 3.8 4.224 (610) .62 1.44 2.3 3.4 4.2 5.1 5.630 (762) .80 1.84 2.9 4.3 4.9 6.5 7.236 (914) .95 2.33 3.6 5.1 6.4 7.840 (1067) 1.0 2.5 3.8 5.6 7.0 8.548 (1219) 1.3 3.1 4.8 6.8 8.6 10.4

.40

.02

.03

.04

.05

.06

.07

.08

.09

.20

.50

.60

.70

.80

.901.0

.30

.10

.01

600

700

800

900

1000

1500

2000

3000

4000

5000




TYPE 'A'TYPE 'A'

TYPE 'B'TYPE 'B'

TYPE 'C'TYPE 'C'



Example: 1-36" x 36" Damper required for14,000 cfm. (Type A)

FAV = 14,0007 sq. ft.

= 2000 fpm





cfmFree Area

Type B: Model FDTB

Type CR: Model FDTC

Type CO: Model FDTC

Type CSR With Collar(Standard):Model FDTC


Model FDTC

HOW TO SPECIFY

SUGGESTED SPECIFICATION:Provide and install, as shown on plans and as described in specifications, Thinline fire dampers as manufactured byManufactured Air Products, meeting or exceeding the following criteria: Fire dampers shall be manufactured, tested andlabeled in accordance with UL 555 Safety Standard for Fire Dampers - Sixth Edition, June 1999, and shall have 1 1/2 hour fireresistance rating. Each fire damper shall bear a UL label verifying fire resistance rating in addition to intended mountingposition. Fire dampers shall be suitably constructed for vertical or horizontal installation as required for each specific location.Thinline style fire damper frame shall be a maximum of 2" (51) in width, roll-formed from G60 galvanized steel. Blades shallbe Thinline type, roll-formed G60 galvanized steel. Each fire damper shall be complete with a (specifier select one) 165°F(74°C) or 212°F (100°C) UL Listed fusible link. Fire dampers shall each include a steel sleeve of appropriate length/gauge andretaining angles, supplied by damper manufacturer to ensure proper installation in accordance with damper manufacturer’sinstructions. Contractor shall provide and install an access door at locations where the fire damper cannot be accessed throughgrille or duct end opening, to allow for inspection, testing and fusible link replacement. Information submitted for approval shallinclude confirmation of UL qualifications, pressure drop data and manufacturer’s installation instructions. Each shipment of firedampers shall include same installation instructions. Thinline fire dampers shall be Manufactured Air Products Models FDTA(Type A), FDTB (Type B), FDTC (Type C).

C22

SIZING CHART • STANDARD FRAME

C

DA

MPER

S

IMPERIAL METRIC IMPERIAL METRIC

TYPE A4" ➔ 60" 100 mm ➔ 1525 mm DUCT HEIGHT – 1/4" DUCT HEIGHT – 6 mm

NOTE: TYPE A DAMPER OVERALL WIDTH = DUCT OPENING – 1/4" (6 mm)

3" ➔ 17" 75 ➔ 425 mm DUCT HEIGHT + 2 1/8" DUCT HEIGHT + 54 mm18" ➔ 27" 450 ➔ 675 mm + 3 1/8" + 79 mm28" ➔ 36" 700 ➔ 925 mm + 4 1/8" + 105 mm

TYPE B 37" ➔ 45" 950 ➔ 1150 mm + 5 1/8" + 130 mm46" ➔ 54" 1175 ➔ 1375 mm + 6 1/8" + 156 mm

NOTE: TYPE B DAMPER OVERALL WIDTH = DUCT OPENING – 1/4" (6 mm)

3" ➔ 5" 75 ➔ 125 mm DUCT HEIGHT + 1 3/4" DUCT HEIGHT + 44 mm6" ➔ 17" 150 ➔ 425 mm DUCT HEIGHT + 2 3/4" DUCT HEIGHT + 70 mm

18" ➔ 27" 450 ➔ 675 mm + 3 3/4" + 95 mm

TYPE C 28" ➔ 36" 700 ➔ 900 mm + 4 3/4" + 121 mm37" ➔ 45" 925 ➔ 1150 mm + 5 3/4" + 146 mm46" ➔ 53" 1175 ➔ 1350 mm + 6 3/4" + 172 mm

NOTE: TYPE C DAMPER OVERALL WIDTH = DUCT OPENING + 1 3/4" (44 mm)

DUCT OPENING HEIGHT OVERALL HEIGHT

Fire Damper Sizing ChartFor All Standard 4 1/4" (108) Frame Fire Dampers:Series/ Models: FDD & FDUse the following chart to determine overall dimensions for Type A, B, and C curtain type fire dampers:

""""

""""

""""

""""

OVE

RAL

L H

EIG

HT

TYPE A

HIGH HATHEIGHT

OVE

RAL

L H

EIG

HT

DU

CT

OPE

NIN

G

TYPE B

HIGH HATHEIGHT

OVE

RAL

L H

EIG

HT

DU

CT

OPE

NIN

G

1"

TYPE C

C23

SIZING CHART • THINLINE FRAME

C

DA

MPER

S

Fire Damper Sizing ChartFor Thinline 2" (51) Frame Fire Dampers:Series/ Model: FDTUse the following chart to determine overall dimensions for Type A, B, and C curtain type fire dampers:

OVE

RAL

L H

EIG

HT

TYPE A

HIGH HATHEIGHT

OVE

RAL

L H

EIG

HT

DU

CT

OPE

NIN

G

TYPE B

OVE

RAL

L H

EIG

HT

DU

CT

OPE

NIN

G

HIGH HATHEIGHT

OVE

RAL

L H

EIG

HT

DU

CT

OPE

NIN

G

1"

TYPE C

IMPERIAL METRIC IMPERIAL METRIC

TYPE A4" ➔ 60" 100 mm ➔ 1525 mm DUCT HEIGHT – 1/4" DUCT HEIGHT – 6 mm

NOTE: TYPE A DAMPER OVERALL WIDTH = DUCT OPENING – 1/4" (6 mm)

3" ➔ 9" 75 ➔ 225 mm DUCT HEIGHT + 2 1/8" DUCT HEIGHT + 54 mm10" ➔ 15" 250 ➔ 375 mm + 3 1/8" + 79 mm16" ➔ 19" 400 ➔ 475 mm + 4 1/8" + 105 mm20" ➔ 25" 500 ➔ 625 mm + 5 1/8" + 130 mm

TYPE B 26" ➔ 31" 650 ➔ 775 mm + 6 1/8" + 156 mm32" ➔ 34" 800 ➔ 850 mm + 7 1/8" + 181 mm35" ➔ 40" 875 ➔ 1025 mm + 8 1/8" + 206 mm41" ➔ 46" 1050 ➔ 1175 mm + 9 1/8" + 232 mm47" ➔ 50" 1200 ➔ 1275 mm + 10 1/8" + 257 mm

NOTE: TYPE B DAMPER OVERALL WIDTH = DUCT OPENING – 1/4" (6 mm)

3" ➔ 9" 75 ➔ 225 mm DUCT HEIGHT + 2 3/4" DUCT HEIGHT + 70 mm10" ➔ 15" 250 ➔ 375 mm + 3 3/4" + 95 mm16" ➔ 19" 400 ➔ 475 mm + 4 3/4" + 121 mm20" ➔ 25" 500 ➔ 625 mm + 5 3/4" + 146 mm

TYPE C 26" ➔ 31" 650 ➔ 775 mm + 6 3/4" + 172 mm32" ➔ 34" 800 ➔ 850 mm + 7 3/4" + 197 mm35" ➔ 40" 875 ➔ 1025 mm + 8 3/4" + 222 mm41" ➔ 46" 1050 ➔ 1175 mm + 9 3/4" + 248 mm47" ➔ 49" 1200 ➔ 1250 mm + 10 3/4" + 273 mm

NOTE: TYPE C DAMPER OVERALL WIDTH = DUCT OPENING + 1 3/4" (44 mm)

DUCT OPENING HEIGHT OVERALL HEIGHT

""""""""

""""""""

""""""""

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CURTAIN TYPE FIRE DAMPERS

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