21_1/4x23_1/4x1 Exact MERV 7 AC Furnace Filters 6 Pack hydro-systems Excellent in hotter growing areas

Excellent in hotter growing areas

Athena Mildew Control formula deactivates the growth of spores

increases vigor

This special blend was formulated for organic growers

Great to have on hand for field crews or for use where ear plugs need to be replaced often

21_1/4x23_1/4x1 Exact MERV 7 AC Furnace Filters 6 Pack hydro-systems Excellent in hotter growing areasNordic Pure MERV 7 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 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters