20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack veg-and-bloom 2W±5%@AC240V 439

2W±5%@AC240V 439

C Bloom and B

Promotes Strong Stems: The high nitrate-to-ammoniacal nitrogen ratio supports better internodal spacing and stronger stems

It fortifies and protects plants from heat

The refractometer resembles a small telescope

20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack veg-and-bloom 2W±5%@AC240V 439Important 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