20x20x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack Commercial Lighting This is a concentrated formula

This is a concentrated formula designed for precision applications

Naccosan is a one-step disinfectant cleaner that is effective against a broad spectrum of bacteria

Pre-harvest treatments with Clearex can enhance flavors and increase yields in fruits

For all foliar applications of specific crops

20x20x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack Commercial Lighting This is a concentrated formulaImportant 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