12x22x1 Exact MERV 14 AC Furnace Filters 6 Pack Nutrients and Supplements These clever little pens make

These clever little pens make it easy to measure the nutrient uptake (pH)

Automatic 1 or 2 point pH calibration

Pressure 150PSI

MagFan is maintenance free

In this way

12x22x1 Exact MERV 14 AC Furnace Filters 6 Pack Nutrients and Supplements These clever little pens makeNordic 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.