11 1/4x11 1/4x1 Exact MERV 14 AC Furnace Filters 12 Pack Steel stake In soil where earth worms

In soil where earth worms have been introduced

and aquaponics

The low-temperature defrost function keeps the unit running efficiently even when ambient temps drop

Working Environments:                Temperature 32-122°F

Use to Raise the pH to the proper levels when pH is too low

11 1/4x11 1/4x1 Exact MERV 14 AC Furnace Filters 12 Pack Steel stake In soil where earth wormsNordic 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.