We are currently running 5-7 business days behind in shipping the 35 Series filters.

Build a Plenum


OK, your Air Flow is Over 750 CFM.

You can purchase the 13F filters HERE.  You will need One filter for every 750 CFM.  (A 1,500 cfm system will need 2 filters…)

To attach the fan to the filters you will build a plenum that looks like this:


…or like this:

(You can use your Back button to return to the previous screen.)

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