20x20x4 (3 5/8) Pleated MERV 13 Air Filters Number Per Box:6 Actual Size: 11 3/4 x

Actual Size: 11 3/4 x 24 3/4 x 3/4 (11

We recommend that you change your air filter every 3-6 months to maintain maximum efficiency and economy

Nordic Pure 20x25x1 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

Nordic Pure 12x25x1 MERV 12 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

20x20x4 (3 5/8) Pleated MERV 13 Air Filters Number Per Box:6 Actual Size: 11 3/4 xActual Size: 19 1 2 x 19 1 2 x 3 5 8 (19. 5 x 19. 5 x 3. 63) Removes lint, household dust, pollen, smoke particles, dust mites, pet dander, virus carriers, mold spores, smog and other contaminants. If you are replacing a Honeywell or Lennox 20x20x4 or an air filter with an MPR rating with an actual depth of 4 3 8, please see our 20x20x5 (4 3 8 actual depth) Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic