![Filterbuy 18x20x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com Filterbuy 18x20x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/81eO2LilbNL._AC_UF1000,1000_QL80_.jpg)
Filterbuy 18x20x1 Air Filter MERV 11 Allergen Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Replacement Furnace Filters - Amazon.com
![Amazon.com: 18x20x1 | Trophy Air | Merv 8 | Washable Furnace Filter | Lifetime HVAC & Furnace Air Filter | Washable | Superior particle-holding Ability | Premium Quality Aluminum : Home & Kitchen Amazon.com: 18x20x1 | Trophy Air | Merv 8 | Washable Furnace Filter | Lifetime HVAC & Furnace Air Filter | Washable | Superior particle-holding Ability | Premium Quality Aluminum : Home & Kitchen](https://m.media-amazon.com/images/I/91xkriqkMrL._AC_UF894,1000_QL80_.jpg)
Amazon.com: 18x20x1 | Trophy Air | Merv 8 | Washable Furnace Filter | Lifetime HVAC & Furnace Air Filter | Washable | Superior particle-holding Ability | Premium Quality Aluminum : Home & Kitchen
![Precisionaire 18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted - Replacement Furnace Filters - Amazon.com Precisionaire 18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/41qvdQGTfZL._AC_UF1000,1000_QL80_.jpg)
Precisionaire 18X20x1 Fbg Furn Filter (Pack Of 12) 1005 Furnace Filters Mounted - Replacement Furnace Filters - Amazon.com
![Aerostar 18x20x1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/4"x 19 3/4" x 3/4"): Amazon.com: Tools & Home Improvement Aerostar 18x20x1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/4"x 19 3/4" x 3/4"): Amazon.com: Tools & Home Improvement](https://m.media-amazon.com/images/I/81cmAUnli1L._AC_UF1000,1000_QL80_.jpg)
Aerostar 18x20x1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 17 3/4"x 19 3/4" x 3/4"): Amazon.com: Tools & Home Improvement
![Filterbuy 18x20x1 Air Filter MERV 13 Optimal Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Amazon.com Filterbuy 18x20x1 Air Filter MERV 13 Optimal Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Amazon.com](https://m.media-amazon.com/images/I/71zg+jIAVaL._AC_UF1000,1000_QL80_.jpg)
Filterbuy 18x20x1 Air Filter MERV 13 Optimal Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) - Amazon.com
![Amazon.com: Nordic Pure 18x20x1 MERV 12 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement Amazon.com: Nordic Pure 18x20x1 MERV 12 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement](https://m.media-amazon.com/images/I/71qktc5YABL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Nordic Pure 18x20x1 MERV 12 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement
![Amazon.com: AIRX FILTERS WICKED CLEAN AIR. ODOR 18x20x1 MERV 8 Carbon Pleated Air Filter Great For Homes With Dogs Cats & Pets - Made in the USA - Box of 6 : Everything Else Amazon.com: AIRX FILTERS WICKED CLEAN AIR. ODOR 18x20x1 MERV 8 Carbon Pleated Air Filter Great For Homes With Dogs Cats & Pets - Made in the USA - Box of 6 : Everything Else](https://m.media-amazon.com/images/I/61DXUNajiWL._AC_UF894,1000_QL80_.jpg)
Amazon.com: AIRX FILTERS WICKED CLEAN AIR. ODOR 18x20x1 MERV 8 Carbon Pleated Air Filter Great For Homes With Dogs Cats & Pets - Made in the USA - Box of 6 : Everything Else
![Amazon.com: Proairtek AF18201M11SWH Model 18x20x1 Pack of 6 Air Filters, MERV 11; Ideal for Anyone Wanting Clean, Crisp Air in Their Home; It Captures Microscopic Airborne Particles Without Impacting Air Flow : Amazon.com: Proairtek AF18201M11SWH Model 18x20x1 Pack of 6 Air Filters, MERV 11; Ideal for Anyone Wanting Clean, Crisp Air in Their Home; It Captures Microscopic Airborne Particles Without Impacting Air Flow :](https://m.media-amazon.com/images/I/81mCLS8MO8L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Proairtek AF18201M11SWH Model 18x20x1 Pack of 6 Air Filters, MERV 11; Ideal for Anyone Wanting Clean, Crisp Air in Their Home; It Captures Microscopic Airborne Particles Without Impacting Air Flow :
![AIRX FILTERS WICKED CLEAN AIR. 18x20x1 Air Filter Odor Eliminator Carbon Filter MERV 8 AC HVAC Furnace Filters 6 Pack - Amazon.com AIRX FILTERS WICKED CLEAN AIR. 18x20x1 Air Filter Odor Eliminator Carbon Filter MERV 8 AC HVAC Furnace Filters 6 Pack - Amazon.com](https://m.media-amazon.com/images/I/718+g0G3ipL._AC_UF894,1000_QL80_.jpg)
AIRX FILTERS WICKED CLEAN AIR. 18x20x1 Air Filter Odor Eliminator Carbon Filter MERV 8 AC HVAC Furnace Filters 6 Pack - Amazon.com
![AIRX WICKED CLEAN AIR. HEALTH 18x20x1 MERV 13 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com AIRX WICKED CLEAN AIR. HEALTH 18x20x1 MERV 13 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com](https://m.media-amazon.com/images/I/51n0qQHg6YL._AC_UF894,1000_QL80_.jpg)
AIRX WICKED CLEAN AIR. HEALTH 18x20x1 MERV 13 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com
![AIRX FILTERS WICKED CLEAN AIR. DUST 18x20x1 MERV 8 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com AIRX FILTERS WICKED CLEAN AIR. DUST 18x20x1 MERV 8 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com](https://m.media-amazon.com/images/I/61LraIU4aQL._AC_UF1000,1000_QL80_.jpg)
AIRX FILTERS WICKED CLEAN AIR. DUST 18x20x1 MERV 8 Pleated Air Filter - Made in the USA - Box of 6 - Amazon.com
![BNX TruFilter 18x20x1 Air Filter MERV 11 (6-Pack) - MADE IN USA - Allergen Defense Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Dust, Pet, Smoke, Allergy MPR 1200 FPR 7 - Amazon.com BNX TruFilter 18x20x1 Air Filter MERV 11 (6-Pack) - MADE IN USA - Allergen Defense Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Dust, Pet, Smoke, Allergy MPR 1200 FPR 7 - Amazon.com](https://m.media-amazon.com/images/I/71FC-y+TfBL._AC_UF1000,1000_QL80_.jpg)
BNX TruFilter 18x20x1 Air Filter MERV 11 (6-Pack) - MADE IN USA - Allergen Defense Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Dust, Pet, Smoke, Allergy MPR 1200 FPR 7 - Amazon.com
![Pamlico Air 18x20x1 MERV 8 Pleated HVAC AC Furnace Air Filters. Case of 12. Exact Size: 17-1/2 x 19-1/2 x 3/4 - Amazon.com Pamlico Air 18x20x1 MERV 8 Pleated HVAC AC Furnace Air Filters. Case of 12. Exact Size: 17-1/2 x 19-1/2 x 3/4 - Amazon.com](https://m.media-amazon.com/images/I/515b1bEPy1L._AC_UF894,1000_QL80_.jpg)
Pamlico Air 18x20x1 MERV 8 Pleated HVAC AC Furnace Air Filters. Case of 12. Exact Size: 17-1/2 x 19-1/2 x 3/4 - Amazon.com
![Filtrete 18x20x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 4 Filters - Replacement Furnace Filters - Amazon.com Filtrete 18x20x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 4 Filters - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/81-l5be+0tL._AC_UF1000,1000_QL80_.jpg)
Filtrete 18x20x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 4 Filters - Replacement Furnace Filters - Amazon.com
![BNX TruFilter 18x20x1 Air Filter MERV 13 (4-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10 - Amazon .com BNX TruFilter 18x20x1 Air Filter MERV 13 (4-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10 - Amazon .com](https://m.media-amazon.com/images/I/7134gxfXS-L._AC_UF894,1000_QL80_.jpg)
BNX TruFilter 18x20x1 Air Filter MERV 13 (4-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies, Pollen, Mold, Bacteria, Smoke, Allergen, MPR 1900 FPR 10 - Amazon .com
![Nordic Pure 18x20x1 MERV 8 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com Nordic Pure 18x20x1 MERV 8 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/71K4FnaiyFL._AC_UF1000,1000_QL80_.jpg)
Nordic Pure 18x20x1 MERV 8 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com
![Amazon.com: Simply by MervFilters 18x20x1 Air Filter, MERV 8, MPR 600, AC Furnace Air Filter, 6 Pack : Tools & Home Improvement Amazon.com: Simply by MervFilters 18x20x1 Air Filter, MERV 8, MPR 600, AC Furnace Air Filter, 6 Pack : Tools & Home Improvement](https://m.media-amazon.com/images/I/71NrHN+FtXL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Simply by MervFilters 18x20x1 Air Filter, MERV 8, MPR 600, AC Furnace Air Filter, 6 Pack : Tools & Home Improvement
![Amazon.com: Nordic Pure 18x20x1 MERV 14 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement Amazon.com: Nordic Pure 18x20x1 MERV 14 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement](https://m.media-amazon.com/images/I/71UXyQQThaL.jpg)
Amazon.com: Nordic Pure 18x20x1 MERV 14 Pleated AC Furnace Air Filters 2 Pack : Tools & Home Improvement
![Amazon.com: Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) : Tools & Home Improvement Amazon.com: Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) : Tools & Home Improvement](https://m.media-amazon.com/images/I/81x2r3LaNsL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) : Tools & Home Improvement
![18X20X1 CARTER | MERV 8 | Lifetime HVAC & Furnace Air Filter | Washable Electrostatic | High Dust Holding Capacity - Amazon.com 18X20X1 CARTER | MERV 8 | Lifetime HVAC & Furnace Air Filter | Washable Electrostatic | High Dust Holding Capacity - Amazon.com](https://m.media-amazon.com/images/I/51o0v2gV33L._AC_UF894,1000_QL80_.jpg)
18X20X1 CARTER | MERV 8 | Lifetime HVAC & Furnace Air Filter | Washable Electrostatic | High Dust Holding Capacity - Amazon.com
![Amazon.com: AIRx Filters Allergy MERV 11 AC Furnace Pleated Air Filter Replacement Box of 6, 18x20x1 Air Filter / 18x20x1 furnace filter Made in the USA : Home & Kitchen Amazon.com: AIRx Filters Allergy MERV 11 AC Furnace Pleated Air Filter Replacement Box of 6, 18x20x1 Air Filter / 18x20x1 furnace filter Made in the USA : Home & Kitchen](https://m.media-amazon.com/images/I/51JWjGCfj0L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: AIRx Filters Allergy MERV 11 AC Furnace Pleated Air Filter Replacement Box of 6, 18x20x1 Air Filter / 18x20x1 furnace filter Made in the USA : Home & Kitchen
![Nordic Pure 18x20x1 MERV 10 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com Nordic Pure 18x20x1 MERV 10 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com](https://m.media-amazon.com/images/I/711hcRSPlUL._AC_UF1000,1000_QL80_.jpg)