18" x 21" x 1" MERV 8 AC & Furnace Filters (6 Pack)

Made in USA
  • SP-18x21x1A-P8M6

  • 5 stars
  • (6)
List Price $199.03

Our Price: $99.51

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Made to order (Ships in 3 business days)
Replace every 3 months
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  • Product Overview
  • Reviews
This item is made to order, non-returnable, and ships within 2-4 business days. Please check the actual dimensions listed below prior to ordering.
Notice: Air filters are often cut slightly smaller than the actual measurement during the manufacturing process. A margin of error of up to 1/8" is allowed without negatively affecting the overall fit and performance of the air filter.
MERV 8 18x21x1 Furnace Filter Overview
  • This is a non-standard size filter. The actual dimensions of the filter are 18" x 21" x 0.75". Please measure your existing filter before ordering to make sure it will be compatible.
  • Long-lasting value package
The MERV 8 21 x 18 x 1 furnace & air conditioner filter will remove the following contaminants:
  • Lint & Dust
  • Dust Mite Debris
  • Pollen
  • Mold Spores
  • Pet Dander
Air Filter FAQs

1 out of 1 people found this review helpful.
5.0 Stars

As advertized

By Man in 60s and over from Caldwell, WV on 6/2/2020 7:45:20AM

Product was just as described with precisely correct dimensions.

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1 out of 1 people found this review helpful.
5.0 Stars

Furnace filter

By Man in 60s and over from Corsica, SD on 6/26/2019 8:45:19AM

Fit perfect no complaints

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1 out of 1 people found this review helpful.
5.0 Stars

Great service/delivery.

By Woman in 60s and over from Olney, MD on 5/28/2020 7:43:37AM

The filters are the correct size and do the job!

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0 out of 0 people found this review helpful.
5.0 Stars

Great product

By Woman in 60s and over on 5/14/2021 6:10:08PM

Will definitely purchase again.

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0 out of 0 people found this review helpful.
5.0 Stars

exactly what was needed

By Anonymous from Adell, WI on 10/26/2021 7:57:19AM

I've no idea why my new furnace has a non-std size for its filter. AllFilters made filters to my size, quality is excellent and price competitive. I will buy again.

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0 out of 0 people found this review helpful.
4.5 Stars

Custom Size

By Woman in 50s from Dania Beach, FL on 6/3/2020 12:26:05PM

Perfect fit air conditioning filter with fast delivery.

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