22x30x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack food-&-water-storage 3" wide drill access points

3" wide drill access points on all four walls for installation of inlet and outlet fittings

Nordic Pure 20x25x4 Plus Carbon Air Filters MERV 7 are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that will attract and capture most airborne particulates in your home

Bacillus mucilaginosus

and one porthole cover—a great value at an affordable price

22x30x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack food-&-water-storage 3" wide drill access pointsNordic Pure Custom MERV 13 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition