Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack
Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack
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Filterbuy 18x20x4 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack

|20.8K ratings

Key item features

  • UNIVERSAL COMPATIBILITY: 18x20x4 replacement air filters for your furnace, air conditioner, or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size: 17.50" x 19.50" x 3.63")
  • MERV 11 PERFORMANCE: Protect your home or business from allergens, pets, and more with MERV 11 synthetic media (comparable with MPR 1200 & FPR 7) that captures 95% of dust without restricting air flow
  • LONG-LASTING FILTRATION: Electrostatically charged media with 8 pleats per foot traps more microscopic particles and lasts 3x longer than fiberglass models (replace every 90 days for optimal performance)
  • SUPERIOR CONSTRUCTION: Easy installation beverage board frames with dual wire backing outperform flimsy cardboard designs by improving durability, preventing warping, and resisting extreme temperatures
  • MADE IN THE USA: Built with industrial-grade, recyclable materials and proudly manufactured 100% in the United States for dependable indoor air quality that is trusted by millions of homes
Current price is $69.98
Price when purchased online
  • Free shipping
  • Free 30-day returns
Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $69.98
Your usuals, on your schedule
Save time and stay stocked!
One-time purchase $69.98

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Sold and shipped by FilterbuyPro Seller
4.588101725703906 out of 5 stars
4.588101725703906 stars out of 5, based on 4404 seller reviews(4.6)
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Customer ratings & reviews

4.6 out of 5 stars
stars
20.8K ratings6,991 reviews
How item rating is calculated
  1. 5 stars82% (17K)
  2. 4 stars8% (1,766)
  3. 3 stars3% (686)
  4. 2 stars2% (379)
  5. 1 star4% (896)
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Showing 1-3 of 6,991 reviews

Jul 7, 2026
Customer
5 out of 5 stars
5 out of 5 stars review

Great Filter

I have been using Filterbuy filters for numerous years and change them out regularly. I have always been pleased with just how good of a filter they are compared to other filters that do not even compare in quality. The price is very reasonable so that is why I always purchase 12 filters at a time and I received them within 2 days of ordering. I will continue using Filterbuy so I do not have to worry about my filters being great!

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889
Jul 6, 2026
Customer
5 out of 5 stars
5 out of 5 stars review

Great filter

The filter is so solid. I previously bought this flimsy filter that bowed immediately and got sucked up into the HVAC unit. After that terrible experience, I had to find a better option. This filter is excellent—well constructed and filtering out inpurities.

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889
Jun 28, 2026
Customer
5 out of 5 stars
5 out of 5 stars review

I always get really good

I always get really good service from Filter Buy. The filters are of high quality and work very well, I changed the filters approximately every 3 months and the system seems to work out really well. Thank you for a very high quality product. Thank you Mike

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889