Filterbuy 18x20x4 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack
Filterbuy 18x20x4 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack
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Filterbuy 18x20x4 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 2-Pack

|27.6K 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 8 PERFORMANCE: Protect your home or business from pollen, lint, mold, and more with MERV 8 synthetic media (comparable with MPR 700 & FPR 5) that captures 90% 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 $64.98
Price when purchased online
  • Free shipping
  • Free 30-day returns
Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $64.98
Your usuals, on your schedule
Save time and stay stocked!
One-time purchase $64.98

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Arrives by Tue, Aug 25
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Sold and shipped by FilterbuyPro Seller
4.592037575486469 out of 5 stars
4.592037575486469 stars out of 5, based on 4471 seller reviews(4.6)
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Customer ratings & reviews

4.7 out of 5 stars
stars
27.6K ratings7,997 reviews
How item rating is calculated
  1. 5 stars86% (23.7K)
  2. 4 stars7% (1,922)
  3. 3 stars2% (630)
  4. 2 stars1% (382)
  5. 1 star4% (1,041)
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Showing 1-3 of 7,997 reviews

Jul 17, 2026
Reviewer name: Customer
Sold byFilterbuy
5 out of 5 stars
5 out of 5 stars review

These are tough!

I wanted to see if I could remove the filter material and mesh from a used merv 8 filter, to use the paperboard frame for another purpose. No way; it was like trying to disassemble a unibody car! No wonder these filters hold their shape so well. They're built like tanks

Review from Filterbuy
Helpful?639SRN6B8RYC126490402
Jul 22, 2026
Reviewer name: Customer
Sold byFilterbuy
5 out of 5 stars
5 out of 5 stars review

I really love getting my filters

The convenience of getting my filters by subscription is great! I never have check the size and then remember to get them at the store then get them home without crushing them in the car. I was buying them several at a time but that took up a lot of space. I am very happy with the price, quality and convenience.

Review from Filterbuy
Helpful?639SRN6B8RYC126490402
Jul 5, 2026
Reviewer name: Customer
Sold byFilterbuy
5 out of 5 stars
5 out of 5 stars review

New filters

I ordered these when our furnace was working. It has now quit and we're getting a new furnace installed tomorrow and I have no idea what size it takes but I'm sure it will be the same as the old one. Can I return these and exchange them for the new size what I find out what it is?

Review from Filterbuy
Helpful?639SRN6B8RYC126490402