Filterbuy 18x24x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 5-Pack
Filterbuy 18x24x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 5-Pack
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Filterbuy 18x24x1 Air Filter MERV 11 Allergy Defense, Pleated HVAC AC Furnace Filter Replacement, 5-Pack

|20.8K ratings

Key item features

  • UNIVERSAL COMPATIBILITY: 18x24x1 replacement air filters for your furnace, air conditioner, or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size: 17.38" x 23.38" x 0.75")
  • 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 14 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

4.6 out of 5 stars
stars
20.8K ratings7,016 reviews
How item rating is calculated
  1. 5 stars82% (17.1K)
  2. 4 stars8% (1,768)
  3. 3 stars3% (687)
  4. 2 stars2% (379)
  5. 1 star4% (900)
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Showing 1-3 of 7,016 reviews

Jul 6, 2026
Reviewer name: 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?5TAPKLC4795Y202640224
Jul 7, 2026
Reviewer name: 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?5TAPKLC4795Y202640224
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?5TAPKLC4795Y202640224
Current price is $48.95
Price when purchased online
  • Free shipping
  • Free 30-day returns
Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $48.95
Your usuals, on your schedule
Save time and stay stocked!
One-time purchase $48.95

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Arrives by Wed, Aug 12
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Sold and shipped by FilterbuyPro Seller
4.588846240686385 out of 5 stars
4.588846240686385 stars out of 5, based on 4429 seller reviews(4.6)
Free 30-day returns