21x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack plant-support Circulating the air also maximizes

Circulating the air also maximizes the application of CO2 in the grow facility

It is also wider

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Flower hardener specially developed and field tested in the Emerald Triangle of Humboldt

A sugar-water feeder ring ensures adult survival

21x21x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack plant-support Circulating the air also maximizesNordic 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.