17x21x1 Exact MERV 12 AC Furnace Filters 6 Pack HVAC & HOME VENTILATION Spraying once or twice a

Spraying once or twice a week will suffice for correcting nutrient deficiencies as well as adding an extra boost to plant health

or a large indoor facility

Ozone is highly reactive to most odor-causing contaminates and allergens

Highly experienced gardeners designed the ultimate ratios of triple washed coco coir

Does not include duct clamps

17x21x1 Exact MERV 12 AC Furnace Filters 6 Pack HVAC & HOME VENTILATION Spraying once or twice aNordic Pure MERV 12 Pleated AC Furnace Air Filters provide exceptional filtration for both home and commercial environments. Each time air passes through a Nordic Pure pleated furnace air filter, lint, dust, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, virus carriers, allergens and other contaminants are removed. MERV 12 furnace filters are comparable to HVAC filters with the rating of MPR 1500 1900. While different