We work through the confusion of CFM to ACH. That's cubic feet per minute your air purifier can move, to how many times in an hour you change (or cycle) the air in a room.

CFM x 60 = CFH .... assume 8' ceiling .... CFH/8 = sq ft footprint per hour of air movement. 2 ACH is this number divided by 2 as max sq ft to get your 2 ACH.

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