20x25x4 (3 5/8) Pleated MERV 14 Air Filters 2 Pack Hydroponics Use it indoors with grow

Use it indoors with grow lights or outdoors in natural light

HANNA's exclusive cartridge pH and ORP electrode

Giving growers the ability to control individual ‘zones’

replaceable trimming and grafting blades are made from SK5 high carbon steel for long lasting durability and have been chrome treated to resist corrosion and provide extra hardness

Insects are repelled by the taste and smell neem

20x25x4 (3 5/8) Pleated MERV 14 Air Filters 2 Pack Hydroponics Use it indoors with growImportant 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