Top 10 21x21x1 Air Filter – Furnace Filters

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1. Filtrete

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MPR 1000, Micro Allergen Defense, AC Furnace Air Filter, 6-Pack exact dimensions 20.81 x 20.81 x 0.81, Filtrete 21x21x1

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Filtrete #ad - Create a change countdown in the filtrete smart app. 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.

Thick air filters. For optimal performance of your heating & cooling system or hvac system, change your home air filter at least every 90 days for 1 in. Outperforms fiberglass, washable and non-electrostatic 3-month pleated 1 in. Filters, and at least every 12 months for 4 in. Attracts and captures particles such as lint, dust, pet dander, pollen, smoke and smog. A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy.

Sign-up for a filter change reminder program that works for you! For residential use only. Slim fit and 5in. Filters. Simply use the app to scan the barcode on your filter’s packaging, 60 or 90 days for your replacement countdown. Find your size: 1000 mpr available in 4in. 4in. 1000 mpr has a rating of MERV 11.
BrandFiltrete #ad
Manufacturer3M #ad
Height20.81 Inches
Length20.81 Inches
Width0.81 Inches
Part NumberAD124-6PK-1E
ModelAD124-6PK-1E
WarrantyLimited Warranty

2. Aerostar

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Pleated Air Filter, Box of 6, 21x21x1, Aerostar 21x21x1 MERV 8, Made in The USA

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Aerostar #ad - Change frequency 60-90 days, Made in the USA. Comparable to mPR 600 Clean Living. Comparable to honeywell Micro Defense Plus FPR 5. Fights lint, pollen, dust mites, pet dander, spores, and dust. Nominal: 21 x 21 x 1, size: 20 7/8"x20 7/8"x3/4" 21x21x1, AC Furnace Air Filter.
BrandAerostar #ad
ManufacturerFiltration Group #ad
Part Number21x21x1 MERV 8

3. Aerostar

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Made in The USA, 21x21x1, Pleated Air Filter, Box of 6, Aerostar 21x21x1 MERV 13

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Aerostar #ad - Comparable to mpr 1500 to 1900 Ultimate Allergen Defense. Change frequency 60-90 days, Made in the USA. Nominal: 21 x 21 x 1, size: 20 7/8"x20 7/8"x3/4" 21x21x1, AC Furnace Air Filter. Comparable to honeywell Allergen Elite FPR 10 Fights lint, spores, smoke, pet dander, dust mites, pollen, fine dust, viruses, and bacteria.
BrandAerostar #ad
ManufacturerFiltration Group #ad
Part Number21x21x1 MERV 13

4. Aerostar

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Actual Size: 16 3/8"x21 1/2"x3/4", 6-Pack, Aerostar Allergen & Pet Dander 16 3/8x21 1/2x1 MERV 11 Pleated Air Filter, Made in the USA

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Aerostar #ad - 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. Check your fit - nominal size: 16 3/8x21 1/2x1; actual size: 16 1/2"x21 1/2"x3/4"; this MERV 11 filter is comparable with MPR 1000-1200 & FPR 7.

Made in the usa - aerostar filters are manufactured in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions for residential, commercial and industrial applications. 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.

Superior filtration efficiency - aerostar filters are made with electrostatically charged synthetic material that draws and captures allergens including lint, dust mites, pet dander, pollen, mold spores, and dust. High performing - 100% synthetic electrostatic media for high efficiency with low air flow resistance. Improve indoor air quality - protect your family and loved ones with clean indoor air quality at home.
BrandAerostar #ad
ManufacturerFiltration Group (Environmental Air) #ad
Height1 Inches
Length16.38 Inches
Width21.5 Inches
Part Number16 3/8x21 1/2x1 MERV 11
Model16 3/8x21 1/2x1 MERV 11

5. Flanders

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Flanders PrecisionAire 84857.012021 20 by 21 by 1 NaturalAire with Baking Soda, 4-Pack

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Flanders #ad - Each filter maintains efficiency for up to 90 days. Merv 8 rating: removes household dust, dirt, pollen, mold spores and more. Pack of 4 air filters designed with baking soda media to control, absorb, and eliminate offensive odors. V-pleats provide large media surface area for more effective filtration while keeping airflow resistance low. Experience the clean air difference. Compatible with hvac systems requiring filters sized 20" x 21".
BrandFlanders #ad
ManufacturerFlanders Corporation #ad
Height21 Inches
Length20 Inches
Width1 Inches
Part Number84857.012021
Model84857.012021

6. Eco-Aire

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Box of 6, 21 x 21 x 1 MERV 8 Pleated Air Filter

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Eco-Aire #ad - Captures airborne particles between 3-10 microns in size. Comparable to the Dust and Pollen: 600 Designed to last up to 60 Days. Nominal: 21x21x1 or 21 x 21 x 1, size: 20 7/8"x20 7/8"x3/4", AC Furnace Air Filter. Made in the USA.
BrandEco-Aire #ad
ManufacturerFiltration Group #ad
Height21 Inches
Length21 Inches
Width1 Inches
Part Number21x21x1 MERV 8

7. Aerostar

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Captures Virus Particles, Actual Size: 19 7/8"x21 1/2"x3/4", Aerostar Home Max 19 7/8 x 21 1/2x1 MERV 13 Pleated Air Filter, Made in the USA, 6-Pack

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Aerostar #ad - 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.

Improve indoor air quality - protect your family and loved ones with clean indoor air quality at home. Check your fit - nominal size: 19 7/8 x 21 1/2x1; actual size: 19 7/8"x21 1/2"x3/4"; this MERV 13 filter is comparable with MPR 1500-1900 & FPR 10 Made in the usa - aerostar filters are manufactured in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions for residential, commercial and industrial applications.

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. Superior filtration efficiency - aerostar filters are made with electrostatically charged synthetic material that draws and captures allergens including lint, mold spores, pollen, dust mites, pet dander, and dust.
BrandAerostar #ad
ManufacturerFiltration Group (Environmental Air) #ad
Height1 Inches
Length19.88 Inches
Weight4.17 Pounds
Width21.5 Inches
Part Number19 7/8 x 21 1/2x1 MERV 13
Model19 7/8 x 21 1/2x1 MERV 13

8. Aerostar

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Box of 4, Aerostar 21x21x1 MERV 13, Made in The USA, Pleated Air Filter, 21x21x1

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Aerostar #ad - Nominal: 21 x 21 x 1, size: 20 7/8"x20 7/8"x3/4" 21x21x1, AC Furnace Air Filter. Comparable to honeywell Allergen Elite FPR 10 Change frequency 60-90 days, Made in the USA. Comparable to mpr 1500 to 1900 Ultimate Allergen Defense. Fights lint, pollen, dust mites, pet dander, fine dust, viruses, spores, smoke, and bacteria.
BrandAerostar #ad
ManufacturerFiltration Group #ad
Part Number21x21x1 MERV 13

9. Glasfloss

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MERV 10, Glasfloss 21-1/2 x 23-5/16 x 1 Air Filters Case of 6, Pleated, Made in USA, Fits Listed Models of Carrier, Bryant & Payne

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Glasfloss #ad - Exact size - 21-1/2 x 23-5/16 x 7/8 21. 5” x 23. 3125” x. 875”, nominal size: 21-1/2” x 23-5/16" x 1”. Fits listed models of carrier, bryant & Payne Air Handlers AHU, Indoor Units See Description Below. Expanded metal backing on Synthetic Media with Heavy-Duty Frame That Resists Moisture. Great for Allergy Sufferers. Merv 10 with no increased resistance over merv 8. Instant upgrade from meRV 7/MERV 8 Pleated Filters.
BrandGlasfloss #ad
ManufacturerGlasfloss Industries #ad
Part NumberZLP21H23E1-6PK
ModelZL Series

10. FilterBuy

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Pack of 6 Filters, 21x22x1 – Silver, FilterBuy 21x22x1 MERV 8 Pleated AC Furnace Air Filter

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FilterBuy #ad - Traps 90% of airborne particles: say goodbye to dust, debris, lint, pollen, and pet dander. Long-lasting: designed to last up to 3 months. Ideal for residential and commercial use.

Synthetic media provides significantly higher particulate efficiency than standard cotton media. Made in the usa: manufactured by FilterBuy in the USA using 100% American made components. Afb silver merv 8, comparable with mPR 300 / 600 clean living and dust & pollen. Say hello to better indoor air quality!21x22x1 merv 8 pleated air filter for ac hvac or furnace pack of 6 filters. High quality: filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F.
BrandFilterBuy #ad
ManufacturerFilterBuy #ad
Part NumberAFB21x22x1M8pk6
ModelAFB21x22x1M8pk6