20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Commercial Lighting No 4 Perlite features LARGE

No 4 Perlite features LARGE and BULKY particles which maximize nutrient uptake

The CenturionPro® Original comes with the largest hopper in the industry

and Bloom nutrient products

short circuit protection

20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack Commercial Lighting No 4 Perlite features LARGENordic 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.