20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Water Treatment 5 inches deep

5 inches deep

Flavor / Carbs / Teas

Apply as a drench once a week thereafter to ensure full control of root-based pests

Once the spores have breached the protective barrier of the cuticle

ventilation and cooling devices

20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack Water Treatment 5 inches deepImportant 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