21x23x1 Exact MERV 7 AC Furnace Filters 6 Pack aaron 4-hour REI and 0-day PHI

4-hour REI and 0-day PHI

Auto-ranging three point calibration with digital fine tuning

Allows air and water to permeate to prevent fungus and diseases

Three square air inlets at bottom

Weight– 38lbs

21x23x1 Exact MERV 7 AC Furnace Filters 6 Pack aaron 4-hour REI and 0-day PHINordic Pure MERV 7 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 and other contaminants are removed. MERV 7 furnace filters are comparable to HVAC filters with the rating of MPR 600. While different companies use different scales to measure the air filters