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

|3,306 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

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Customer ratings & reviews

4.5 out of 5 stars
stars
3,306 ratings986 reviews
How item rating is calculated
  1. 5 stars80% (2,642)
  2. 4 stars8% (255)
  3. 3 stars4% (120)
  4. 2 stars3% (105)
  5. 1 star6% (184)
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Showing 1-3 of 986 reviews

Aug 23, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

They are huge.

They are thick and seem to do the job. The house seems to be a little less dusty. Have at least a year or two supply. The prices worked well for us. The more I bought the less the actual price. Win Win.

Review from Filterbuy
Helpful?639SRN6B8RYC126490402
Aug 21, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

Been using for the past

Been using for the past 4-5 years. Had very good experience. Very quickly received my order and zero problems. Price seems to high vs some discount locations. wng

Review from Filterbuy
Helpful?639SRN6B8RYC126490402
Aug 28, 2026
Reviewer name: Customer
5 out of 5 stars
5 out of 5 stars review

First time using this brand.

First time using this brand. I have been in the natural gas business with a service department for 44 yrs. Now retired. I will see how they hold up in my own house. Thank you for your inquiry.

Review from Filterbuy
Helpful?639SRN6B8RYC126490402
Current price is $69.98
Price when purchased online
  • Free shipping
  • Free Holiday returns until Jan 31
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 Wed, Oct 7
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Sold and shipped by FilterbuyPro Seller
4.5946178686759955 out of 5 stars
4.6 stars out of 5, based on 4645 seller reviews(4.6)
Extended holiday returns
Free Holiday returns until Jan 31