16x21x1 MERV 13 Plus Carbon AC Furnace Filters 12 Pack Amendment Rubber gasket pre-installed on exterior

Rubber gasket pre-installed on exterior for an air tight seal

Advanced safety features including oxygen depletion sensor

Perfect for general outdoor and around the house use

Wait at least 2 weeks before replanting treated soil

while the single-bucket Root Spa systems use a single dedicated air pump

16x21x1 MERV 13 Plus Carbon AC Furnace Filters 12 Pack Amendment Rubber gasket pre-installed on exteriorNordic Pure pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a much healthier living space.