17x20x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack controllers Automatic Calibration– Automatic calibration at

Automatic Calibration– Automatic calibration at 1382 ppm (mg/L) with a single push of a button

*Important - hot re-strike can take up to 15 minutes

Its unique air ventilation and circulation design does not require air pumping to generate additional oxygen in and hot air out of the growing chamber

Helps with ensuring maximum protection against the cold

apply throughout vegetative growth stages for vigorous plant growth

17x20x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack controllers Automatic Calibration– Automatic calibration atNordic 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.