Determining blower CFM
Determining blower CFM
(OP)
How can I determine the output CFM of a blower? I know the horsepower of the motor, outlet size and fan diameter. What else do I need and how do I figure out the volume flow rate?
Thanks.
Thanks.





RE: Determining blower CFM
RE: Determining blower CFM
Remember when checking flow velocities in a duct, the air velocity distribution is not uniform throughout the duct. This holds especially true when there are bends or reductions in your duct near your measurement point.
-Reidh
RE: Determining blower CFM
RE: Determining blower CFM
Tobalcane
"If you avoid failure, you also avoid success."
RE: Determining blower CFM
Tobalcane
"If you avoid failure, you also avoid success."
RE: Determining blower CFM
RE: Determining blower CFM
RE: Determining blower CFM
Tobalcane
"If you avoid failure, you also avoid success."
RE: Determining blower CFM
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For best results you need to be in a good straight section of duct, at least 8 equivalent diameters downstream. Doing a traverse directly at the fan discharge is useless.
RE: Determining blower CFM
Dik
RE: Determining blower CFM
In a traverse, the duct is divided into sections small enough to be sure that enough data points are taken to ensure a representative sampling. For round ducts, samples are usually taken 90 degrees apart, and distances calculated so each position represents an annular region of equal area.