smooth side
Nordic Pure 12x20x1 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
activated carbon furnace filters absorb odors on a molecular level
Nordic Pure 16x20x2 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
Nordic Pure chose to follow the industry standard
16 3/8x21 3/8x1 Exact MERV 13 AC Furnace Filters Number Per Box:6 smooth sideActual Size: 16 3 8 x 21 3 8 x 3 4 (16. 38 x 21. 38 x 0. 75) Removes lint, household dust, pollen, smoke particles, dust mites, pet dander, virus carriers, mold spores, smog and other contaminants. Ideal for customers looking for superior filtration Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 13 is equivalent to MPR 2200 2400 Made in the USA. Nordic Pure MERV 13 Pleated AC Furnace Air