#1 Measure the size of the space you wish to capture the airborne pollutants.
 

#2 The CFM of the fan motor is the rate of filtration. Take the cubic feet of the space and you can outpace rate of contamination.

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#3 Use of a high velocity fan is best, but you will need the 24" high volume filter.

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

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