12x16x1 MERV 13 AC Furnace Filters 12 Pack Sea Green Hydro Select your wanted differential from

Select your wanted differential from the four preset settings

Moderate Infestation/Speckling: 5+ per square foot

A light meter allows growers an accurate means of adapting to their plants' needs as the light conditions change during a full growing season

(Ca) Calcium

12x16x1 MERV 13 AC Furnace Filters 12 Pack Sea Green Hydro Select your wanted differential fromNordic 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