21 1/2x26x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Ventilation They reliably warm the root

They reliably warm the root zone to 10ºF-20ºF above ambient air temperature

General frequencies of use: Every 12 weeks throughout the growing season

These trays can be readily incorporated into your growing operation

Light·Mix® has been blended to ensure optimal drainage throughout the entire medium

Weight: 25 3/4 lbs

21 1/2x26x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Ventilation They reliably warm the rootNordic 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.