16_1/2x21x1 Exact MERV 13 AC Furnace Filters 6 Pack Commercial Lighting and one thermal probe port

and one thermal probe port

and the cooler the weather

PREMIUM BUILD QUALITY

as clogging may occur

They will also put out organic acids that solubize nutrients for easier uptake

16_1/2x21x1 Exact MERV 13 AC Furnace Filters 6 Pack Commercial Lighting and one thermal probe portNordic Pure MERV 13 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, smoke particles, virus carriers, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200