Calculating CMF in HVAC

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farrukh saleem Participant Join Date: Jan 2011 Location: abu dhabi Posts: 3	Calculating CMF in HVAC 01/19/2011 2:45 PM
	how can i calculate CMF and duct size in HVAC? __________________ farrukh saleem
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farrukh saleem Participant Join Date: Jan 2011 Location: abu dhabi Posts: 3	#2 In reply to #1 Re: Calculating CMF in HVAC 01/19/2011 2:55 PM
	what is Q v ? A ? __________________ farrukh saleem
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Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7425 Good Answers: 295	#3 In reply to #2 Re: Calculating CMF in HVAC 01/19/2011 5:33 PM
	What is CMF? __________________ Semper Ubi Sub Ubi
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Anonymous Poster	#4 Re: Calculating CMF in HVAC 01/19/2011 5:45 PM
	it's CFM not CMF CFM air flow in cubic feet / min Q = V X A in CFM V = Air velocity in feet per min A = Duct cross section area in squire feet
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#5 Re: Calculating CMF in HVAC 01/19/2011 6:50 PM
	According to the LynDoor Intergalactic Dictionary CMF is the Country Music Factor that affects the duct size. Take the square of the inverse of the duct area and multiply that by the funk factor. This gives you the duct size.
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KJK/USA Guru Join Date: Apr 2010 Location: Mid Western USA - The Corn Belt Posts: 1439 Good Answers: 58	#6 Re: Calculating CMF in HVAC 01/20/2011 8:52 AM
	HELLOOOOO CMF - Cubic Minutes per Foot Multiply the length of the country music track (minutes) by the length of the duct (feet) then divide by 3.14159265358979323846264338327950288419716939937510 __________________ The first 5 days after a weekend are always the hardest................................
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tom.b Participant Join Date: Jan 2011 Posts: 1	#7 Re: Calculating CMF in HVAC 01/22/2011 9:16 AM
	Very easy every Ahu has a cfm rating ask manufature then get a ductulater and that will tell you the amount of duct and size.Also ductulator will keep the volume within the cfm rating for the amount of straight run and turns needed also the amount of drops.the ductulator will also help in sizing the return.the ductulator is a little hard to understand at first.you can get the ductulator at any supply house that sells duct ie.. Anderson
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Anonymous Poster (2); Doorman (1); farrukh saleem (1); KJK/USA (1); lyn (1); tom.b (1)

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