how can tell the cfm?

[kurokaze]

I've got a bunch of no-name fans and when I power them up then feel like they are pushing alot of air but I'm not sure how much. Is there any way I can measure the cfm?

thanks!

 

[Tempus]

There is a tool that tells you RPM, CFM, etc. But is rather expensive. The only way otherwise is too look on the venders site.

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[peteb]

I guess that's tough when they are no-name - crystal ball anyone? ;o)



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[kurokaze]

My thoughts exactly..

well I've come up with a rough idea of how many cfm it is.

Get one fan of which you know the cfm (same size perferably) and the other and have them set up to blow towards each other (you'll want maybe 2 inches of space).
Take a sheet of paper and dangle it between the two blowing fans (tissue won't work since its too light).. if it blows towards your control fan, then this noname has greater cfm, other it has less.

Not an accurate result.. but good enough for a rough determination eh?