16x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack Master Controller You simply connect the ONA

You simply connect the ONA Carbon-Air to your existing ventilation system to distribute throughout your room or air exhaust system

Includes: 2-stage oversized housings with pleated

and other AV equipment

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How often should I apply it

16x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack Master Controller You simply connect the ONAImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 16x20x4 filter