17x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom It has a double glass

It has a double glass window---the inner glass is tempered and the outer glass is made of explosion proof material

Apply as a foliar spray every 3-4 days for 21 days for active infestation

Simple operation and maintenance

75 x 26 x 7

Dilution Solutions Nutrient Delivery System (NDS) Monitor Kit 1 1/2 in (HYKMON150)

17x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack X Nutrients bloom It has a double glassNordic 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.