21x21x1 MERV 14 AC Furnace Filters Number Per Box:6 Keep that measurement in mind

Keep that measurement in mind when you are measuring your furnace air filter

Nordic Pure 20x24x1 MERV 7 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

MERV 15 furnace air conditioner filters are comparable to HVAC filters with the rating of MPR 2800

Replaces Honeywell 20x20x4 and filters with an MPR rating with an actual depth of 4 3/8 and ideal for helping keep equipment working efficiently and reducing odors

MERV 8 furnace air condition filters are comparable to HVAC filters with the rating of MPR 800

21x21x1 MERV 14 AC Furnace Filters Number Per Box:6 Keep that measurement in mindActual Size: 20 3 4 x 20 3 4 x 3 4 (20. 75 x 20. 75 x 0. 75) Airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, smoke, and bacteria are captured and removed. Ideal for customers with health problems or for commercial units which support a rating of MERV 14 and above Hypoallergenic, antimicrobial, and electrostatic filter media. Moisture resistant frame. Nordic Pure MERV 14 is equivalent to MPR 2800 Made in the USA. Nordic Pure