HVAC Duct Calculator

8/18/2019 HVAC Duct Calculator

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Excel are prerequisites for using this spreadsheet.

Microsoft Excel version 97 is the minimum requirement to use the spreadsheet but Microsoft

Excel version 2000 or greater is recommended to utilize the full features of the spreadsheet.

We strongl suggest that ou print out and read the instructions on using this electronic spreadsheet

!his spreadsheet can be do"nloaded from the #$$# %stem &esign "

'lease visit the "ebsite often to chec( for updates to the spreadsheet. !he most recent version

number is listed on )otes tab.

Welcome to the electronic spreadsheet version for the #$$#

Manual &* +rd Edition (D3) ,, -esidential &uct %stems* 200

# thorough understanding of the D3 manual as "ell as a "or(ing (no"ledge of Microsoft

!his spreadsheet uses revised versions of the printed D3 "or(sheets.

/se the printed D3 manual for guidance to enter information into the Efective Length,

Friction Rate and Duct Sizing tabs.

that are contained in the follo"ing Help tab.

ACCA System Design

http://www.acca.org/designhttp://www.acca.org/design


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ACCA Manual D, 3rd Edition

*** Refer to the Notes Tab to verify the latest revision ***

Help Section

Refer to Manual D Residential Duct Systems, Third Edition Version 1.xx

Step 1Enter the linear feet of trun and runout ducts in the length sections for the su!!ly ducts.

Re!eat the ste!s a"o#e for the return ducts.

Step !

Enter the $%eating C&M$ and $&an S!eed ' $Cooling C&M$ and $&an S!eed$.

(ext enter $Com!onent )ressure *osses$ for all com!onents and accesories external of the fan unit.

Step !

There is a maximum of + su!!ly runs !er unit.

&or larger rooms di#ide the -T% "y the num"er of runs re/uired for !ro!er distri"ution of airflo0.

The !rogram 0ill automatically select the duct sie for round metal duct0or.

&or rectangular metal duct0or enter the height and the !rogram 0ill automatically select the duct sie.

2f &lex Duct is used refer to the E/ui#ilent &lex column to select the correct duct sie.

nder the su!!ly trun, return run and return trun sections, select the associated su!!ly runs and the

C&M and duct sies 0ill automatically calculate.

The !rogram 0ill automatically select the duct sie for round metal duct0or.

&or rectangular metal duct0or enter the height and the !rogram 0ill automatically select the duct sie.

2f &lex Duct is used refer to the E/ui#ilent &lex column to select the correct duct sie.

3o to the Effe"tive #en$th Tab and enter u! to 4 su!!ly runs to determine the longest e/ui#ilent run in the system.

Clic on the %roup Code and find the e/ui#ilent length for all fi ttings used in the selected su!!ly runs.

5ou can list multi!le %roup Code letters se!arated "y a comma and enter the total effecti#e length for all fittings.

The !rogram 0ill automatically select the $Total E/ui#ilent &eet$ to "e used in the &ri"tion Rate Tab'

3o to the &ri"tion Rate Tab and enter the $External Static )ressure$ for the selected e/ui!ment.

The !rogram 0ill automatically calculate the $Design &riction Rate$ #alue to "e used for Du"t Si(in$'

3o to the Du"t Si(in$ Tab and enter the heating and cooling -T% for each su!!ly run.


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#ir $onditioning $ontractors of #merica* Manual &* !hird Edirtion

Effe"tive #en$th )orsheet

Element Su!!ly Run 2D (um"er

Straight Run*ength *ength *ength *ength

Trun *ength

Trun *ength

Trun *ength

Runout *ength

&ittings3rou! Effecti#e 3rou! Effecti#e 3rou! Effecti#e 3rou! Effecti#e

*etters *ength *etters *ength *etters *ength *etters *ength

6ther

6ther 6ther

6ther

6ther

Total *ength

Design TE* +

Element Return Run 2D (um"er

Straight Run*ength *ength *ength *ength

Trun *ength

Trun *ength

Trun *ength

Runout *ength

&ittings3rou! Effecti#e 3rou! Effecti#e 3rou! Effecti#e 3rou! Effecti#e

*etters *ength *etters *ength *etters *ength *etters *ength

6ther

6ther

6ther

6ther

Total *ength

Design TE* +

3rou! 1 7

3rou! + 7

3rou! 8 7

3rou! 4 7

3rou! 9 7

3rou! : 7

3rou! 11 7

3rou! 1+ 7

3rou! ; 7

3rou! < 7

3rou! = 7

3rou! 9 7

3rou! 1 7

3rou! 11 7

3rou! 1+ 7


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#ir $onditioning $ontractors of #merica* Manual &* !hird Edition

&ri"tion Rate )orsheetSte! 1> Manufacturer?s -lo0er Data

External static !ressure @ES)> 2C

C&M from manufacturers ta"les%eating Cooling

&an S!eed Med %igh

Ste! +> Com!onent )ressure *osses @C)*>

Direct ex!ansion refrigerant coilElectric resistance heating coil

%ot 0ater coil

heat exchanger

*o0 efficiency filter

%igh or midBefficiency filter

Electronic filter

%umidfier

Su!!ly outlet

Return grille

V lights or other de#ice

Total com!onent losses @C)*> Error 2CSte! 8> A#aila"le Static )ressure @AS)> VA*E 2C

Ste! 4> Total Effecti#e *ength @TE*> &eet

Ste! ;> &riction Rate Design Value @&R> VA*E 2C'1

-alancing dam!er 7


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#ir $onditioning $ontractors of #merica* Manual &* !hird Edition

Du"t Si(in$ )orsheet 1Supplyside Runouts E-uiv

.D Roo/ .D 0tuh Ctuh 0t$ Cf/ Cl$ Cf/ Dsn Cf/ Round Si(e 2elo"ity &inal Si(e 0ei

SRB1 D2V' D2V' D2V' VA*E VA*E VA*E

SRB+ D2V' D2V' D2V' VA*E VA*E VA*E



SRB; D2V' D2V' D2V' VA*E VA*E VA*E

SRB< D2V' D2V' D2V' VA*E VA*E VA*E

SRB= D2V' D2V' D2V' VA*E VA*E VA*E


SRB: D2V' D2V' D2V' VA*E VA*E VA*E



SRB1+ D2V' D2V' D2V' VA*E VA*E VA*E



SRB1; D2V' D2V' D2V' VA*E VA*E VA*E

SRB1< D2V' D2V' D2V' VA*E VA*E VA*E

SRB1= D2V' D2V' D2V' VA*E VA*E VA*E


SRB1: D2V' D2V' D2V' VA*E VA*E VA*E

SRB+ D2V' D2V' D2V' VA*E VA*E VA*E

+ + 4D.25+6 4D.25+6 4D.25+6

Supplyside Truns E-uiv

.D Asso"iated Supply Runs Dsn Cf/ Round Si(e 2elo"ity &inal Si(e 0ei1 + 8 4 ; < = 9 : 1 11 1+ 18 14 1; 1< 1= 19 1: +

STB1 VA*E VA*E VA*E

STB+ VA*E VA*E VA*E

STB8 VA*E VA*E VA*E

STB4 VA*E VA*E VA*E

STB; VA*E VA*E VA*E

STB< VA*E VA*E VA*E

STB= VA*E VA*E VA*E

STB9 VA*E VA*E VA*E

Returnside Runouts E-uiv

.D Asso"iated Supply Runs Dsn Cf/ Round Si(e 2elo"ity &inal Si(e 0ei

RRB1 VA*E VA*E VA*E

RRB+ VA*E VA*E VA*E

RRB8 VA*E VA*E VA*E

RRB4 VA*E VA*E VA*ERRB; VA*E VA*E VA*E

RRB< VA*E VA*E VA*E

RRB= VA*E VA*E VA*E

RRB9 VA*E VA*E VA*E

RRB: VA*E VA*E VA*E

RRB1 VA*E VA*E VA*E

Returnside Truns E-uiv

.D Asso"iated Supply Runs Dsn Cf/ Round Si(e 2elo"ity &inal Si(e 0ei

RTB1 VA*E VA*E VA*E

RTB+ VA*E VA*E VA*E

RTB8 VA*E VA*E VA*E

RTB4 VA*E VA*E VA*E


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Release (otes

Version MD8 1. 1SE): 2nitial Release

Version MD8 1.1 8(6V: Added heating and cooling cfm?s and fan s!eed on &riction Rate ta"

2ncreased su!!ly runs to + on Duct Siing ta"2ncreased su!!ly truns to 9 on Duct Siing ta"

Decreased return runs to 1 on Duct Siing ta"

Eliminated second Duct Siing ta"

Sho0 heating and cooling cfm?s on Duct Siing ta"

HVAC Duct Calculator

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Transcript of HVAC Duct Calculator