For filter installation the air enters thru the fuzzy
Nordic Pure 20x25x4 Plus Carbon Air Filters MERV 12 are made of a dual material where the MERV rated material has been fused together with a carbon layer
Approximately MERV 8 efficiency rating
Ideal for customers with apartments
Replaces Honeywell 16x20x4 and filters with an MPR rating with an actual depth of 4 3/8 and ideal for superior filtration and odor control or commercial units
21x22x1 MERV 10 Plus Carbon AC Furnace Filters 12 3/4x21x1 For filter installation the airActual Size: 20 1 2 x 21 1 2 x 3 4 (20. 5 x 21. 5 x 0. 75) Removes lint, household dust, pollen, smoke particles, dust mites, pet dander, virus carriers, mold spores, help eliminate unwanted odors and other contaminants. Ideal for customers who not only need odor control but whose daily life demands high filtration Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 10 is equivalent to MPR 1000