#1 Measure the size of the space you wish to capture the airborne pollutants. length x width x height cubic feet
 

#2 The CFM(cubic feet per minute) of the fan motor is the rate of filtration. Take the cubic feet of the space, and the cfm is now the rate filtration and you can now easily outpace the rate of contamination.

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#3 Use of a high velocity fan is best, we suggest a 24" high volume filter.

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#4 The key is use as big a fan as possible, and the appropriate filter .

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