21 x 21 x 1 21 x 21 x 1 Size 21 x 21 x 1 air filters are displayed on this page. Actual size for these air filters is 20 7/8" x 20 7/8" x 0.8". For custom air filter sizes, please use our custom air filter creator.
Location

21 x 21 x 1

21 x 21 x 1

Size 21 x 21 x 1 air filters are displayed on this page. Actual size for these air filters is 20 7/8" x 20 7/8" x 0.8". For custom air filter sizes, please use our custom air filter creator.

 
Filtrete HVAC Basic Fiberglass
Filtrete HVAC Basic Pleated
Filtrete 1000 Micro Allergen
Filtrete 1900 Maximum Allergen
Pack Size 6 6 6 6
Rating MERV 6 MERV 8 1000 1900
Change Frequency 30 Days 90 Days 90 Days 90 Days
Equipment Protection
Lint and Dust
Pollen
Pet Dander -
Mold Spores -
Dust Mites -
Fine Dust - -
Auto Emissions - -
Smoke - - -
Very Fine Dust - - -
Bacteria - - -
Tobacco Smoke - - -

21 x 21 x 1

Filtrete HVAC Basic Fiberglass
Pack Size
6
Rating
MERV 6
Change Frequency
30 Days
Equipment Protection
Lint and Dust
Pollen
Pet Dander
-
Mold Spores
-
Dust Mites
-
Fine Dust
-
Auto Emissions
-
Smoke
-
Very Fine Dust
-
Bacteria
-
Tobacco Smoke
-
Filtrete HVAC Basic Pleated
Pack Size
6
Rating
MERV 8
Change Frequency
90 Days
Equipment Protection
Lint and Dust
Pollen
Pet Dander
Mold Spores
Dust Mites
Fine Dust
-
Auto Emissions
-
Smoke
-
Very Fine Dust
-
Bacteria
-
Tobacco Smoke
-
Filtrete 1000 Micro Allergen
Pack Size
6
Rating
1000
Change Frequency
90 Days
Equipment Protection
Lint and Dust
Pollen
Pet Dander
Mold Spores
Dust Mites
Fine Dust
Auto Emissions
Smoke
-
Very Fine Dust
-
Bacteria
-
Tobacco Smoke
-
Filtrete 1900 Maximum Allergen
Pack Size
6
Rating
1900
Change Frequency
90 Days
Equipment Protection
Lint and Dust
Pollen
Pet Dander
Mold Spores
Dust Mites
Fine Dust
Auto Emissions
Smoke
Very Fine Dust
Bacteria
Tobacco Smoke
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Filtrete On Demand

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.

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