cfm ?

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Feb 11, 2006 | 03:16 AM

wmcrn

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cfm ?

does anyone know the cfm flow of a 3 inch vs a 3.5 inch straight pipe?

Feb 11, 2006 | 03:23 AM

TheBlurLS1

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Some quick calculations tell me 3" is only about 73.4% of 3.5" if you happen to have the rates for one or the other

Feb 11, 2006 | 03:31 AM

wmcrn

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does exhaust piping work on a ratio/portion bases, if it does i have the figures for a 2 inch pipe and can gather the info for that.

Feb 11, 2006 | 03:58 AM

wmcrn

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i figured it out. this is a rough estimate, depending on exhaust length but its 115 cfm per sqaure inch. by my calculations a 3 inch pipe = 800 cfm. which is about where i need to be.

Feb 11, 2006 | 02:56 PM

TheBlurLS1

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Quote:

Originally Posted by wmcrn

does exhaust piping work on a ratio/portion bases, if it does i have the figures for a 2 inch pipe and can gather the info for that.

It works on cross sectional area of the pipe.

You can figure the area of 2" pipe, then divide it by the area of a 3" pipe, multiply by 100, and you get the percentage the 2" will flow compared to a 3".

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