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#1
01-30-2006, 07:56 AM
 Unregistered Guest Posts: n/a
FPM to CFM

I need to measure the amount of cfm in a 24" pipe, I can calculate the FPM but how can I convert to CFM.
#2
01-31-2006, 06:28 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,416 Rep Power: 12
Re: FPM to CFM

You need to multiply the feet per minute times the cross-sectional area of the pipe.

Make sure all units are the same base unit.

feet/minute * square feet = cubic feet/minute

The formula for the area of a circle is Pi*radius˛, with radius being 1/2 the diameter.

Is the 24" the inside diameter? If so then:
3.14 * (1 foot * 1 foot) = 3.14 square feet

FPM * 3.14 square feet = CFM
#3
05-30-2006, 01:57 AM
 dr_rupa Guest Posts: n/a
Re: FPM to CFM

I need to know 500 FPM = how much CFM
#4
05-30-2006, 04:54 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,416 Rep Power: 12
Re: FPM to CFM

That depends on the cross-sectional area of the pipe. (or river or whatever it is)

feet/minute (FPM) * square feet = cubic feet/minute (CFM)
#5
12-06-2006, 01:04 PM
 mflanagan Guest Posts: n/a
Re: FPM to CFM

How do you calculate the cross sectional?
#6
12-06-2006, 04:38 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,416 Rep Power: 12
Re: FPM to CFM

The formula for the cross-sectional area of a pipe is:

#7
03-02-2009, 07:19 PM
 britt44 Guest Posts: n/a
Re: i need to find out how much cfm s i need

I need to find out how many cfms i need to in a 1000 square foot space with 12 foot ceilings
#8
03-04-2009, 10:00 PM
 Unregistered Guest Posts: n/a
Re: FPM to CFM

you will need
1200 cfm
#9
03-28-2009, 05:52 AM
 Unregistered Guest Posts: n/a
Re: FPM to CFM

Quote:
 Originally Posted by Unregistered you will need 1200 cfm
According to ASHRAE you will need to know what the space is used for and or how many people are going to be in it (if in the usa). most office spaces require 20cfm/person of outdoor air alone! and then whatever u need for cooling, usually .5cfm/sq ft. you should call a hvac contractor as i've been out of the business for about 5 years and dont have the latest figures, but that's what it was when i was designing systems, good luck!
#10
06-20-2010, 12:33 AM
 Unregistered Guest Posts: n/a
Re: FPM to CFM

Quote:
 Originally Posted by mflanagan how do you calculate the cross sectional?
1000fpm how mach cfm

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