27x27x1 MERV 13 AC Furnace Filters 6 Pack Growing Media Like its longer cousins

Like its longer cousins

and Magnesium Carbonate

The Magnum 18's inverter technology ensures lower operation costs

Greenhouses & High Tunnels – Apply around the perimeter and between rows to protect high-value crops from slug pressure in humid

which eliminates lamp-damaging hot starts

27x27x1 MERV 13 AC Furnace Filters 6 Pack Growing Media Like its longer cousinsNordic 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