20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack bloom nutrients 000 gallons US) of nutrient

000 gallons US) of nutrient solution

Can be used up to day of harvest

Squirrel proof: -Yes

PPF Efficacy : 2

Nordic Pure 14x25x2 MERV 7 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack bloom nutrients 000 gallons US) of nutrientImportant 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