If you are replacing a Honeywell or Lennox 20x25x4 or an air filter with an MPR rating with an actual depth of 4 3/8
Nordic Pure 18x20x1 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
the effective life of your filter depends on the environment in which you live
Nordic Pure 15x20x1 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
as developed by ASHRAE (the American Society of Heating
20x30x2 Pleated MERV 14 Air Filters 10x28x1 If you are replacing aActual Size: 19 3 4 x 29 3 4 x 1 3 4 (19. 75 x 29. 75 x 1. 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