16x20x4 (3 5/8) Pleated MERV 8 Air Filters 2 Pack Water Pumps & Irrigation Supplies The average level of CO2

The average level of CO2 in the atmosphere is about 300 ppmv (parts per million)

Easy-to-read screen and multiple display modes

Choose an SG ballast for its 120V/240V capability (120V cord included

Surgical stainless steel holds a sharp edge longer

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16x20x4 (3 5/8) Pleated MERV 8 Air Filters 2 Pack Water Pumps & Irrigation Supplies The average level of CO2Important 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