Size 20 x 21 1/2 x 1 air filters are displayed on this page. Actual size for these air filters is 19 7/8" x 21 1/2" x 0.8". For custom air filter sizes, please use our custom air filter creator.
|Rating||MERV 6||MERV 8||1000||1900|
|Change Frequency||30 Days||90 Days||90 Days||90 Days|
|Lint and Dust|
|Very Fine Dust||-||-||-|
Backed by extensive 3M research; independent testing and in-home use tests, each Filtrete Filter is designed to meet the specific needs of homeowners and businesses. Filtrete Filters are designed to achieve the proper balance between particle removal efficiency and pressure drop (air flow). An electrostatic charge is applied to the filter media fibers, which attract and capture airborne particles.
In Door Air Quality - You care about the quality of your indoor air, and Filtrete air filters ensure that you breathe the difference. The filterís electrostatically charged media attracts and captures large and microscopic particles, including pollen, mold spores, pet dander, bacteria, smoke and particles that can carry viruses and odors.
Air Conditioning and Furnace Filter Performance Ė Filtrete air filters help properly designed forced air systems function well by cleaning the air without excessive air flow restriction. All Filtrete filters have a pressure drop less than .20 on a water gauge which is less than most competitorís entry level filters.