17x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack beneficial microbes Shelf life is best maintained

Shelf life is best maintained between 50°F–85°F

Treat all of the water holding sites in connected water systems to maximize efficiency of the treatment program

Different oils work best with different voltages

Heavy duty insulating material

Elastic closures on both ends of sleeves for snug

17x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 12 Pack beneficial microbes Shelf life is best maintainedNordic 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.