Reply by Sawkerf

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Posted on DC as a air filter - Novel or Bad idea?

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1730 posts in 3190 days

#1 posted 10-11-2011 08:11 PM

Not really, Snowfrog.

A cfm flow rating is the product of the velocity (ft/min) times the cross sectional area of the inlet (sq ft) If your impeller housing inlet is 6” (~0.2 sq ft) in diameter, the velocity is ~6000 ft/min (~60 mph) – at the inlet.

If you had no ducting, and moved away from the inlet, the cross sectional area suddenly jumps depending on the dimensions of the space. By the time you get across the room, the velocity is effectively zero and dust stays where it is.

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