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Proudly made in usa - us patent #10, 249 B2. Hvac filter: castle filters have 400% more surface area for dust and other particles to collect.
While pleated filters need to be replaced about once a month, the Castle Air Filter lasts one year which is 4-12x longer than the others. Save energy and lower land fill contribution: castle Air Filter helps you save energy with its advanced filtration technology and also helps in generating less waste as it need not be changed every month like a standard filter.


Recommended use - recommended for homes with pets, people with allergies, homes with smokers, or anyone wanting cleaner air.2

1. BestAir
#ad
BestAir BA2-1620-8 AC Furnace Air Filter, Removes Allergens & Contaminants, Fits 100%, MERV 8, for 2" HVAC Pleated Models,Pack of 1, 16" x 20" x 2", White
#adBestAir #ad - Serves as a universal replacement for any 2" hvac pleated filter 16" x 20"; Actual Size: 15 1/2 x 19 1/2 x 1 3/4". Minimum efficiency reporting value merv of 8; generating good filtration with fewer particles and contaminants that pass through the filter; Pleated design allows the BestAir filter to trap up to 79% of airborne particles from 03 to 100 microns.More information #ad
Designed to perform with high efficiency and minimum pressure drop; conserving energy and lowering costs; Filter life up to 3 months. Filters out unwanted particles including dust lint, mold particles, bacteria, pollen, and virus carriers while allowing cleaner air to flow through.Brand | BestAir #ad |
Manufacturer | BestAir #ad |
Height | 15.5 Inches |
Length | 19.5 Inches |
Weight | 0.55 Pounds |
Width | 1.75 Inches |
Part Number | BA2-1620-8 |
Model | BA2-1620-8 |
Warranty | N/a. |
More information #ad
2. Nordic Pure
#ad
Nordic Pure 20x20x5 MERV 8 Honeywell/Lennox Replacement AC Furnace Air Filter 1 Pack
#adNordic Pure #ad - Made in the USA. Nominal size: 20 x 20 x 5 h, actual size: 19 5/8 x 19 7/8 x 4 3/8 19. 63 x 19. 88 x 4. 38. Measure your air filter for the exact size and compare it to our actual size to ensure proper fit.More information #ad
Replaces honeywell 20x20x4 and filters with an MPR rating with an actual depth of 4 3/8 and ideal for helping keep equipment working efficiently and reducing odors. Nordic pure merv 8 is equivalent to MPR 800 .Brand | Nordic Pure #ad |
Manufacturer | Nordic Pure #ad |
Height | 4.38 Inches |
Length | 19.63 Inches |
Weight | 3.85 Pounds |
Width | 19.88 Inches |
Part Number | 20x20x5HM8-1 |
Model | 20x20x5 (4-3/8 Actual Depth) |
More information #ad
3. BestAir
#ad
MERV 8, BestAir HW2025-8R Air Cleaning Furnace Filter, Removes Allergens & Contaminants, 20" x 25" x 4", 1 Count Pack of 1, Single Pack, For Honeywell Models
#adBestAir #ad - Minimum efficiency reporting value MERV of 8; generating good filtration with fewer particles and contaminants that pass through the filter. 0 microns; long life filter design for long lasting performance up to 12 months. Designed to perform with high efficiency and minimum pressure drop; conserving energy and lowering costs.More information #ad
Filters out unwanted particles including dust lint, bacteria, pollen, mold particles, and virus carriers while allowing cleaner air to flow through. Pleated design allows the bestair filter to trap up to 79% of airborne particles from 03 to 10 .Brand | BestAir #ad |
Manufacturer | BestAir #ad |
Height | 24.75 Inches |
Length | 20 Inches |
Weight | 0.02 Pounds |
Width | 4.25 Inches |
Part Number | HW2025-8R |
Model | HW2025-8R |
Warranty | N/a. |
More information #ad
4. Glasfloss
#ad
INC. Air Filter, MERV 8, 20x30x1, GLASFLOSS INDUSTRIES
#adGlasfloss #ad - Designed to meet the performance and the maximum filter life. Glasfloss air filters meet the regulations for MERV 10 instead of MERV 8. 90-day filter life. 100% synthetic Media.More information #ad
Brand | Glasfloss #ad |
Manufacturer | Glasfloss Industries #ad |
Part Number | ZLP20301 |
Model | ZLP20301 |
More information #ad
5. Tier1
#ad
Tier1 20x32x1 Merv 8 Pleated Air/Furnace Filter -6 Pack
#adTier1 #ad - With automated manufacturing to ensure consistent construction. Easy installation: Easy to replace and install. Actual size: 20x32x. 75. 30 times more efficient than ordinary fiberglass filters at capturing the smallest, most troublesome particles 3-10 microns in size.More information #ad
Electrostatically charged filter media that doesn't promote the growth of bacteria, mold, mildew, or fungi so they're a great choice for families with small children. Made in the u. S. A.Brand | Tier1 #ad |
Manufacturer | Tier1 #ad |
Height | 0.75 Inches |
Length | 19.88 Inches |
Weight | 30 Pounds |
Width | 31.88 Inches |
Part Number | P85S_612032_6_PACK |
More information #ad
6. Castle Filters
#ad
MERV 8, 14x30x1, Castle Filters One-Year HVAC Furnace Filter, 1 Count Pack of 1
#adCastle Filters #ad - The internal foam is treated with a sticky material to collect more dust while letting the air pass through. Merv 8: the high-flow merv 8 air filter effectively removes 93% of the most harmful dust particles and offers superior protection of your equipment and home while still allowing maximum air-flow.Proudly made in usa - us patent #10, 249 B2. Hvac filter: castle filters have 400% more surface area for dust and other particles to collect.
More information #ad
Patented filter technology: castle filters use 3 layers of ΒΌ-inch open-celled foam, 183, with a patented tacky center layer that catches dust like fly paper. Lasts one year: the furnace filter holds up to 20 times more dust than a pleated filter. While pleated filters need to be replaced about once a month, the Castle Air Filter lasts one year which is 4-12x longer than the others. Save energy and lower land fill contribution: castle Air Filter helps you save energy with its advanced filtration technology and also helps in generating less waste as it need not be changed every month like a standard filter.
Brand | Castle Filters #ad |
Manufacturer | No Toil #ad |
Height | 1 Inches |
Length | 30 Inches |
Weight | 0.75 Pounds |
Width | 14 Inches |
Part Number | 000014301 |
Model | 000014301 |
Warranty | One year. |
More information #ad
7. Nordic Pure
#ad
Nordic Pure 20x20x4 MERV 8 Pure Baking Soda Odor Deodorizing AC Furnace Air Filter 1 Pack
#adNordic Pure #ad - If you are replacing a pure baking soda 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.More information #ad
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. Natural, eco-friendly baking soda media with no added fragrances. Absorb smells from pets, smoking, cooking and other household odors. Made in the USA.Brand | Nordic Pure #ad |
Manufacturer | Nordic Pure #ad |
Height | 3.63 Inches |
Length | 19.5 Inches |
Weight | 1 Pounds |
Width | 19.5 Inches |
Part Number | 20x20x4PBS |
Model | 20x20x4 (3-5/8 Atcual Depth) |
More information #ad
8. Honeywell Home
#ad
AC Furnace Air Filter, Honeywell Home 20x25x4 MERV 8, 1 PACK CF100A1025 Actual Dimensions: 19.94 x 24.87 x 4.38 in.
#adHoneywell Home #ad - Easy installation - honeywell Home's easy-to-install air filters make changing out your air filtration unit quick, painless, and mess-free. A healthier household - breathe easy in your home with a Honeywell Home 4-Inch High Efficiency Air Cleaner Filter that helps keep hazardous airborne particles out and fresh air flowing in.Recommended use - recommended for homes with pets, people with allergies, homes with smokers, or anyone wanting cleaner air.2
More information #ad
20x more effective than typical 1-inch fiberglass filters. Long lasting filtration - Lasts up to 12 months without losing quality over time. Merv 8 rating - get exceptional protection against dust, fungus, viruses, pollen, bacteria, and spores.Brand | Honeywell Home #ad |
Manufacturer | Honeywell Home #ad |
Height | 4.38 Inches |
Length | 24.88 Inches |
Weight | 1 Pounds |
Width | 18.84 Inches |
Part Number | CF100A1025/U |
Model | CF100A1025/U |
Warranty | 1 Year Limited |
More information #ad
9. Glasfloss
#ad
INC. Air Filter, GLASFLOSS INDUSTRIES, 20x25x1, MERV 8 Pack of 6
#adGlasfloss #ad - Glasfloss air filters meet the regulations for MERV 10 instead of MERV 8. 90-day filter life. Designed to meet the performance and the maximum filter life. 100% synthetic Material.More information #ad
Brand | Glasfloss #ad |
Manufacturer | Glasfloss Industries #ad |
Part Number | ZLP20251 |
Model | ZLP20251 |
More information #ad