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a 20x30x1 air filter is actually 19 ½ x 29 ½ x ¾
HVAC systems should be rated to handle filters of MERV 14 and above
No matter the name of the rating
Nordic Pure MERV 15+ is equivalent to MPR 2800
12x25x 1/2 Half Inch Ring Panel MERV 10 Furnace Air Filters Number Per Box:12 a 20x30x1 air filter isActual Size: 11 1 2 x 24 1 2 x 1 2 (11. 5 x 24. 5 x 0. 5) Captures large airborne particles like household dust, allergens, mold spores, pet dander and smoke particles. Ideal for customers with apartments, window units, campers, and RVs. Antimicrobial high capacity, polyester material with an added layer of smooth poly blend electrostatic filter media For filter installation the air enters thru the fuzzy, high loft side and exits out the thinner,