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This blog is written by clagwell | 11 entries so far

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Boxfan Ambient Air Filter Hack Revisited #6: CFM and Efficiency - Part B, the Filter

06-28-2020 05:00 PM by clagwell | 0 comments »

In the last post we looked at the effect of CFM on the length of time it takes to reduce the dust concentration in a room. That applies to either venting outside and bringing in clean air or passing the air through a perfect filter. Lacking a perfect filter we have to ask what effect the filter capture efficiency has on the air clearing rate? Let’s start with the example from the previous post and assume 1,000 particles per cubic foot to start. At 500 CFM we’re sending 500,000 particles per minute through the filter. If the filter is, say, 80% efficient then we’re removing 0.80×500,000 particles per minute = 400,000 particles per minute from the room. A 0.80...

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