20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 2 Pack shoe-cover Superior performance in premium air

Superior performance in premium air ducting

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This powerful blend gives your plants that extra push to maximize flower yields

These crucial ingredients are used in abundance by plants in their fruiting or flowering cycle and the extra levels provided by Ionic PK Boost can lead to larger flowers and greatly increased fruit and vegetable yields

20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 2 Pack shoe-cover Superior performance in premium airImportant 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