16x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack spl_hw This formula has been specially

This formula has been specially designed speed up absorption rates and can start affecting your plants within a couple of hours after use

A popular leaf shine

Psyllids(Mult)

Bacterial Complex (Burkholderia glumae

16x20x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack spl_hw This formula has been speciallyImportant 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