16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack vacuum pump If you need a biofungicide/bactericide

If you need a biofungicide/bactericide that not only fends off disease but also improves the health of your plants and flowers

extreme weather and other biotic and abiotic stresses

The complete kit includes one fan

Chemboys Ph Up MAX is the Strongest Liquid pH UP on the Market

16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack vacuum pump If you need a biofungicide/bactericideImportant 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