20x25x4 (3 5/8) Pleated MERV 7 Air Filters 1 Pack Environmental Controllers Other features include smaller

Other features include smaller

It is also recommended to have a refrigerant scale and nitrogen tank with regulator to operate this unit

6" x 20'' Standard Carbon Air Filter

Chafers (European

Neptune's Harvest Liquid Crab & Lobster Shell offers you the nutrient goodness of Neptune's Harvest Crab & Lobster Shell in a liquid formulation

20x25x4 (3 5/8) Pleated MERV 7 Air Filters 1 Pack Environmental Controllers Other features include smallerImportant 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 20x25x4 filter