19x21 1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters Number Per Box:6 Particles in indoor air are

Particles in indoor air are measured in microns

Nordic Pure 16x25x4 Plus Carbon Air Filters MERV 15 are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that will attract and capture most airborne particulates in your home

MERV 12 furnace filters are comparable to HVAC filters with the rating of MPR 1500-1900

For example

Nordic Pure 14x14x1 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

19x21 1/2x1 Exact MERV 7 Plus Carbon AC Furnace Filters Number Per Box:6 Particles in indoor air areActual Size: 19 x 21 1 2 x 3 4 (19 x 21. 5 x 0. 75) Captures large airborne particles like lint, household dust, pollen, dust mites, mold spores and other contaminants. This dust reduction air filter is ideal in keeping your AC and furnace equipment working efficiently and helps reduce odors Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 7 is equivalent to MPR 600 Made in the USA. Nordic Pure