18x22x1 MERV 14 AC Furnace Filters 12 Pack Growing Accessories 4" x 10'' Standard Carbon

4" x 10'' Standard Carbon Air Filter

there is no need to change the screen when switching over from a DRY run to a WET run

greatly reducing the risk of phytotoxic effects

Derived from molasses

18x22x1 MERV 14 AC Furnace Filters 12 Pack Growing Accessories 4" x 10'' Standard CarbonNordic Pure MERV 14 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, coughs and sneezes, smog, allergens and other contaminants are removed. MERV 14 furnace filters are comparable to HVAC filters with the rating of MPR 2800.