13x20x1 Exact MERV 13 AC Furnace Filters 6 Pack Emitters Each bag is made of

Each bag is made of 80% polyethylene and 20% nylon with 4 mil thickness for excellent strength and resistance to permeability

Add a bulb of your choice (sold separately)

Optimal for flowering but can be used for Veg as well

Does not apply to the actual fertilizing materials (active ingredients)

- Can be used on most types of fruits & vegetables

13x20x1 Exact MERV 13 AC Furnace Filters 6 Pack Emitters Each bag is made ofNordic Pure MERV 13 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 13 furnace filters are comparable to HVAC filters with the rating of MPR 2200