21x23x1 Exact MERV 7 AC Furnace Filters 6 Pack controllers and provides microbial nutrition

and provides microbial nutrition

Due to the natural taper of the saucer

• Maintains balanced metabolism for plants grown with C02 and HID lighting

Faster plant growth Higher harvest yields

21x23x1 Exact MERV 7 AC Furnace Filters 6 Pack controllers and provides microbial nutritionNordic Pure MERV 7 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 and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters