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Filterbuy 18x21x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 6-Pack
Key item features
- UNIVERSAL COMPATIBILITY: 18x21x1 replacement air filters for your furnace, air conditioner, or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size: 18.00" x 21.00" x 0.75")
- 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 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
Specs
Current price is USD$79.98
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Subscribe, Your usuals, on your schedule, Save time and stay stocked!, $79.98
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$79.98
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4.592815707273538 out of 5 stars
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Showing 1-3 of 8,001 reviews
Aug 16, 2026
Reviewer name: Customer
5 out of 5 stars
We decided to filter at
We decided to filter at the cold air returns rather that at the air handler. The goal was to reduce the amount of dust in the house. The 12x12x1 filters fit the returns perfectly. We've noticed no difference in air flow. It's too early to determine if there is less dust. The filters are of high quality. If the change we made in filter location works the way we want, we'll definitely be purchasing more from Filter Buy.
Review from Filterbuy
Helpful?4LHGZURFVCGI700840546
Aug 2, 2026
Reviewer name: Customer
2 out of 5 stars
The width of my requested
The width of my requested filter was 16 3/8. Instead, you sent a 16 1/2" width. That additional 1/8 " was significant enough that it made the filter installation very difficult. I even sustained some damage to the filter trying to force it into the slot. The air condioning manufacture assigned this very precise measurement for a reason. I have tried to use FilterBuy to save money. It appears that I will have to return to the premium price filter to eliminate the problem with fit.
Review from Filterbuy
Helpful?4LHGZURFVCGI700840546
Jul 28, 2026
Reviewer name: Customer
4 out of 5 stars
Unlike the hardware store, my size is always in stock
I've gone to my local hardware store on multiple occasions to find my size sold out. So my filters are doing extra duty while I wait. This will eliminate that problem. I set a reminder in my calender to go down and change it out. Now FilterBuy needs to put a QR code in the box so when I pull the last one out I scan the code and click a reorder button.
Review from Filterbuy
Helpful?4LHGZURFVCGI700840546
