20x25x4 (3 5/8) Pleated MERV 13 Air Filters 1 Pack Water Pumps & Irrigation Supplies Base Size: 9

Base Size: 9

ZeroTol is a powerful tool to contain pathogens and stop the spread of diseases in your grow

It works equally well to treat and control bacteria

NO dissolved mineral salts

Consistent

20x25x4 (3 5/8) Pleated MERV 13 Air Filters 1 Pack Water Pumps & Irrigation Supplies Base Size: 9Important 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 20x25x4 filter