If you’re in the market for air filters 20x20x4, you won’t want to miss our Best air filters 20x20x4 list in 2023. Our carefully curated selection is based on 17614 customer reviews gathered from all around the world – giving it a truly global perspective!
See what others are raving about now and make sure that your next purchase will be one of lasting value.
Bestseller No. 1
Nordic Pure 20x20x4 MERV 12 Pleated AC Furnace Air Filters 2 Pack
- Nominal Size: 20 x 20 x 4, Actual Size: 19 1/2 x 19 1/2 x 3 5/8 (19.5 x 19.5 x 3.63)
- Measure your air filter for the exact size and compare it to our actual size to ensure proper fit.
- If you are replacing a Honeywell or Lennox 20x20x4 or an air filter with an MPR rating with an actual depth of 4 3/8, please see our 20x20x5 (4 3/8 actual depth)
- Nordic Pure MERV 12 is equivalent to MPR 1500-1900
- Made in the USA
Bestseller No. 2
Filtrete 20x20x4, AC Furnace Air Filter, MPR 1550 DP, Healthy Living Ultra Allergen Deep Pleat, 2-Pack (actual dimensions 19.88 x 19.88 x 4.31)
- OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system
- DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
- ATTRACTS AND CAPTURES microscopic particles such as smoke, cough and sneeze debris, bacteria and viruses--and large particles, including lint, household dust and pollen
- 1550 MPR has a rating of MERV 12
- The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it
Bestseller No. 3
20x20x4 MERV 8 Pleated HVAC AC Furnace 4 Air Filters by Pamlico. 3 Pack. Actual Size: 19-1/2 x 19-1/2 x 3-3/4
- NOMINAL SIZE: 20x20x4 | EXACT SIZE: 19-1/2 x 19-1/2 x 3-3/4 | Does not replace 5" or 4-3/8" depth filters.
- 20x20x4 FILTRATION LEVEL RATING: MERV 8, MPR 600, FPR 5. Captures 90% of airborne particles without inhibiting air flow. Traps particles such as dust, mold spores, pollen, lint, pet dander, debris, hair.
- IMPROVE AIR QUALITY: Our air filters are made using an advanced pleated technology that offers more air coverage, enhance particle capture performance and helps extends the life of your furnace, air conditioner, or HVAC system.
- STURDY, DURABLE CONTRUCTION: Constructed from a two-piece frame provides rigidity and durability. Electrostatically charged pleats captures more harmful particles and prolongs the products lifespan by up to 3 times over fiberglass filters. Industrial-grade dual side beverage board frames outperforms standard one-sided cardboard designs.
- MADE IN USA. Suggested to replace at least every 3 months for optimal performance.
Bestseller No. 4
Aerostar 20x20x4 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4")
- Nominal size: 20x20x4; Actual size: 19 1/2"x19 1/2"x3 3/4"; This MERV 11 filter is comparable with MPR 1000-1200 & FPR 7.
- Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke. Made with electrostatically charged synthetic material for high filtration efficiency with low air flow resistance
- Simple to install and a cost-effective step towards a healthier home environment. Replace 3"-5" filters every 3-6 months.
- 100% synthetic electrostatic media for high efficiency with low air flow resistance
- Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive
Bestseller No. 5
Glasfloss ZL 20x20x4 MERV 10 AC & Furnace Filters. 6 Pack. Actual Size: 19-1/2 x 19-1/2 x 3-3/4
- Actual Size: 19.5” x 19.5” x 3.75” | Nominal Size: 20x20x4
- MERV 10 Efficiency with MERV 8 Air Flow (.25" W.C.)
- Air Filters for homes, business, schools, apartments, hotels and industrial.
- Durable and sturdy galvanized metal backing.
- Made in the USA. For optimal performance, recommended to change at least every 3 months.
Bestseller No. 6
Honeywell FC100A1011-5pk 20" x 20" x 4" MERV 11 Replacement Filter (Pack of 5)
- 20X20 Media Air Filter-MERV 10
- Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2 1999
- Efficiency ranges are defined for small particles, E1=0.3 to 1.0 microns; medium particles, E2=1.0 to 3.0 microns; and large particles, E3=3.0 to 10.0 microns
- Country of origin: United States
Bestseller No. 7
Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 8
Honeywell 20x20x4 AC Furnace Air Filter Replacement - FC100A1011 HVAC Furnace Filters with Merv 11 Filter Media, AC Filter with Homequip Disposal Bag 2-Pack (Actual Size: 19.94 x 19.75 x 4.38 Inches)
- Honeywell FC100A1011 20x20x4 Replacement Filter, Minimum Efficiency Reporting Value (MERV) 11
- High efficiency media filter captures particles as small as 0.3 micron
- Requires no maintenance except periodic (every 6-12 months), super easy, in-and-out media filter replacement.
- Compatibility - This 4 inch air filter is designed to fit most 20x20x4 models including all Honeywell and many of Aprilaire, Space-Gard, and Trion Air Bear models
- Homequip Filter Disposal Bag lets you dispose of your old filter properly
Bestseller No. 9
Aerostar 20x20x4 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4")
- Nominal size: 20x20x4; Actual size: 19 1/2"x19 1/2"x3 3/4"; This MERV 8 filter is comparable with MPR 600 & FPR 5.
- Designed to filter microscopic particles such as lint, dust mites, spores, and pollen
- Simple to install and a cost-effective step towards a healthier home environment. Filters that are three inches thick or more can be changed any time after 90 days.
- 100% synthetic electrostatic media for high efficiency with low air flow resistance
- Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive
Bestseller No. 10
Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 11
Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 12
Filterbuy 20x20x4 Air Filter MERV 11 Allergen Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 11 synthetic media (comparable with MPR 1000 - 1200 & FPR 7) protects homes from pets, allergies, and more by trapping 95% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 13
20x20x4 MERV 10 Pleated 4'' Inch AC Furnace Air Filters by Glasfloss. Quantity 2. Actual Size: 19-1/2 x 19-1/2 x 3-3/4, White
- Actual Size: 19-1/2 x 19-1/2 x 3-3/4 | Nominal Size: 20x20x4
- Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6.
- Air Flow is comparable to a MERV 8 with improved filtration. Made in the USA. Ideal for residential and commercial use.
- Note: Does not replace 5" inch or 4-3/8" Depth filters. Please check actual filter size needed.
Bestseller No. 14
Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 15
Filterbuy 20x20x4 Air Filter MERV 8 Dust Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 8 synthetic media (comparable with MPR 600 & FPR 5) protects homes from dust, pollen, and more by trapping 90% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 16
Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches)
- 20x20x4 replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 19.38" x 19.38" x 3.63")
- MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without impacting air flow
- High-quality construction features an electrostatically charged, pleated design that captures more harmful particles and prolongs the products lifespan by 3 times that of fiberglass models
- Industrial-grade beverage board frames with dual wire backings outperform standard cardboard designs
- All components are manufactured within the United States and designed with recyclable materials
Bestseller No. 17
Aerostar Home Max 20x25x4 MERV 13 Pleated Air Filter, Made in the USA, Captures Virus Particles, (Actual Size: 19 1/2"x24 1/2"x3 3/4"), 6-Pack
- CHECK YOUR FIT - Nominal size: 20x25x4; Actual size: 19 1/2"x24 1/2"x3 3/4"; This MERV 13 filter is comparable with MPR 1500-1900 & FPR 10.
- SUPERIOR FILTRATION EFFICIENCY - Aerostar filters are made with electrostatically charged synthetic material that draws and captures allergens including lint, dust mites, mold spores, pollen, pet dander, and dust.
- IMPROVE INDOOR AIR QUALITY - Protect your family and loved ones with clean indoor air quality at home. Aerostar filters are a simple to install and cost-effective step towards a healthier home environment, free of airborne allergens and particles that can trigger various allergy and asthma symptoms.
- HIGH PERFORMING - 100% synthetic electrostatic media for high efficiency with low air flow resistance. For best results, change your filters every 60 to 90 days during normal times of year but increase frequency to 30 days during peak summer and winter months when your unit is working the hardest.
- Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive
Bestseller No. 18
Filtrete 20x20x4, AC Furnace Air Filter, MPR 1000 DP, Micro Allergen Defense Deep Pleat, 2-Pack (actual dimensions 19.88 x 19.88 x 4.31)
- OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system
- DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through
- ATTRACTS AND CAPTURES particles such as lint, pollen, dust, pet dander, smoke and smog
- 1000 MPR has a rating of MERV 11
- The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it
SaleBestseller No. 19
TopTech TT-FM-2020 Ready to Use TechPure TTFM2020 Air Filter 20x20x4 Top Tech OEM Cartridge 20 by 20 by 4 in Furnace MERV 11 Carrier TT-MAC-2122 TT-MAC-2020
- Direct replacement
- Ready to use , no assembly required
- MERV 11 high eficiency filter
- Removes allergens and air pollutants
SaleBestseller No. 20
Honeywell FC100A1011 Media GENUINE OEM 2-Pack Special
- Actual filter size: 19 7/8" x 19 7/8" x 4 3/8"
Our selection of top-rated air filters 20x20x4 provides something for everyone, no matter your budget. We’re sure you’ll find the perfect item to fit all your needs!
