20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack spl_bfg They have a higher red

They have a higher red spectral ratio enhancing flowering and growth

Use inline throughout your watering cycle — no bypass needed

Taped seams (blue tape) provide superior protection to coveralls made with serged seams that are exposed

The bin is made of clear plastic so you can easily see when it’s full

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20x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 12 Pack spl_bfg They have a higher redNordic 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.