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

|3,278 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

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Customer ratings & reviews

4.4 out of 5 stars
stars
3,278 ratings1,160 reviews
How item rating is calculated
  1. 5 stars74% (2,440)
  2. 4 stars10% (320)
  3. 3 stars5% (174)
  4. 2 stars4% (120)
  5. 1 star7% (224)
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Showing 1-3 of 1,160 reviews

Aug 20, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

Affordable and effective

I love these filters. Affordable and effective. It's amazing to see how much they have collected when it's time to change them. The subscription service is great. A little extra savings and a subtle reminder that you forgot to change them. LOL. But I usually notice when it's time if I forget, I find myself sneezing and having itchy eyes in the house. Which always improves once I change them Highly recommend these and Filterbuy

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889
Aug 27, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

Perfect fit

Filter fit perfectly. Former homeowner had never changed put filter, for at least 10 years, and it was so nasty. I cleaned area out as best I could, and once the filter arrived, placed it where it belonged. It fit perfectly and the air is so much fresher!

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889
Jun 25, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

Well Made, good price

These are very well made and much more affordable than what is sold at the local retailer. I like that I can put these on a subscription that suits my needs. I have always rented and remembering to change the filters has always been a chore. I want my new home's a/c to work well, timely filter replacement is important for that and this makes it easier to do so.

Review from Filterbuy
Helpful?21Z9ZDBQ8AV7168633889
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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Arrives by Mon, Sep 28
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Sold and shipped by FilterbuyPro Seller
4.593770420387715 out of 5 stars
4.593770420387715 stars out of 5, based on 4591 seller reviews(4.6)
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