20x25x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Packs pump The Autopilot PX1 Digital Lighting

The Autopilot PX1 Digital Lighting Controller from Hydrofarm provides centralized

These durable poly covers are easy to set up and take down and also resist shifting temperatures

countdown timers

The BVV Mini XL closed loop extractor is perfect for the connoisseur

20x25x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 2 Packs pump The Autopilot PX1 Digital LightingImportant 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