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Particles in indoor air are measured in microns
a 20x30x1 air filter is actually 19 ½ x 29 ½ x ¾
Hypoallergenic and antimicrobial pleated electrostatic filter material
the Air Bear Cub Replacement Plus Carbon has a nominal and actual depth of 3 inches exactly
this is why we ask you to compare the exact dimensions
15 1/2x29x1 Exact MERV 14 Plus Carbon AC Furnace Filters 15x19x1 Particles in indoor air areActual Size: 15 1 2 x 29 x 3 4 (15. 5 x 29 x 0. 75) 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 but needing an odor control element Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 14 is equivalent to MPR 2800 Made in the USA.