21x23x1 Exact MERV 8 AC Furnace Filters 6 Pack eligible-for-discount Important Note: Almost ALL furnace

Important Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air condition filter

Raised bottom and unique multi-drainage holes and slits for optimum aeration of the root zone

Compatible with 120V controllers and timers

Contains natural pyrethrins widely used in organic growing because of its rapid breakdown

The ILUMINAR 1000W DE is part of the Commercial Series

21x23x1 Exact MERV 8 AC Furnace Filters 6 Pack eligible-for-discount Important Note: Almost ALL furnaceNordic Pure MERV 8 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores and other contaminants are removed. MERV 8 furnace filters are comparable to HVAC filters with the rating of MPR 800. While different companies use different scales to measure the air filters