20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack Nutrients Beneficial Microorganisms (nitrogen-fixing & composting

Beneficial Microorganisms (nitrogen-fixing & composting bacteria)

colemani respond to alarm signals from plants to locate the aphids where they feed on the honeydew aphids excrete

9% Yucca schidigera ​ Extract (Wetting Agent)

mini-split air conditioners

We recommend the 2 mil for the better workability and strength

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack Nutrients Beneficial Microorganisms (nitrogen-fixing & compostingImportant 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 20x20x4 filter