12x24x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon Number Per Box:6 a 20x30x1 air filter is

a 20x30x1 air filter is actually 19 ½ x 29 ½ x ¾

and pollen

Nordic Pure 10x10x1 MERV 10 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 MERV 15+ is equivalent to MPR 2800

0 micron contaminants and up to 65% of 1

12x24x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon Number Per Box:6 a 20x30x1 air filter isActual Size: 11 1 2 x 23 3 8 x 3 5 8 (11. 5 x 23. 38 x 3. 63) Airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, smoke, and bacteria are captured and helps eliminate unwanted odors and other contaminants. Ideal for customers looking for superior filtration and odor control or for commercial units which support a rating of MERV 15 and above Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame.