Customer reviews from filtrete.com
3M - Filtrete 20 in. W X 20 in. H X 4 in. D Polyester 12 MERV Pleated Allergen Air Filter 1 pk
Average customer rating
4.7
(208 Reviews)
Rating breakdown 208 reviews
5 Stars
188
4 Stars
6
3 Stars
2
2 Stars
2
1 Star
10
96%of customers recommend this product.
(
177 out of
184)
Customer Reviews for 3M - Filtrete 20 in. W X 20 in. H X 4 in. D Polyester 12 MERV Pleated Allergen Air Filter 1 pk
Customer Rating
1
Undersized. Not of advertised value.
on July 31, 2023
Posted by: Slim Fit
Product size states 20x25x4. Inconspicuously designated as slim fit. Actual size is 19.5x24.5x3.25.
This is new. I have purchased this product for many years. This is the first time I have encountered this.
This is new. I have purchased this product for many years. This is the first time I have encountered this.
Response from filtrete.comBy 3M-Filtrete, 3M-Filtrete Care Team, August 2, 2023
Hello, thank you for taking the time to leave your review. Your experience is not what we would expect, and we would appreciate the opportunity to discuss this with you and gather further details. Please connect with our team at 1-800-388-3458 Mo-Fri 8am-4:30pm CT. Thanks again, and we look forward to your call.
Written by a customer while visiting filtrete.com
Customer Rating
5
Traps Everything
on November 20, 2015
Posted by: Rick H
from Central PA
Gender:Male
I have been using these for about 15 years now and love them. You would be amazed at how much stuff you can see trapped in one even after just a month. It will remove pollen, and even smoke and mold from the air. I would suggest getting a few for a season, especially if you dodn't have central air and are running the heat for the first time in the fall with a filter this fine. You will probably end up changing the first one after a month, then ever 3 after that unless there are constant pollutants in your house, like a lot of smoke or a mold problem.
I would recommend this to a friend!
Written by a customer while visiting filtrete.com
Customer Rating
1
16x20x4 does not fit Honeywell / Lennox filter box
on March 4, 2025
Posted by: Sergey K
Buyers beware: The actual size of the 16x20x4 was reduced at some point last couple of years. As the result it doesn't properly fit in Honeywell / Lennox filter boxes, despite the advertisement on the packaging.
The filter size used to be 15-7/8" x 19-7/8" x 4-5/16". The new filter size is 15-7/16" x 19-3/4" x 4-5/16", so it is 7/16" (1 cm) narrower than the old filter.
The filter size used to be 15-7/8" x 19-7/8" x 4-5/16". The new filter size is 15-7/16" x 19-3/4" x 4-5/16", so it is 7/16" (1 cm) narrower than the old filter.
Response from filtrete.comBy 3M-Filtrete Care Team, 3M-Filtrete, March 8, 2025
Hello, thank you for taking the time to leave your review. Your feedback is very important to us, and we will be sure to forward your comments. If you have any additional feedback or questions, please feel free to reach out to our team at 1-800-388-3458 Mo-Fri 8am-4:30pm CT.
Written by a customer while visiting filtrete.com
Customer Rating
1
Filter width changed without proper labeling
on August 10, 2025
Posted by: HonestFeedback
[This review was collected as part of a promotion.] I have been purchasing 16x25x4 filters for years. 3M recently changed the filter design (thick paper stock casing has no diagonal elements) but also the width. As a result the filter width is 1 centimeter too narrow and thus leaves a gap through which unfiltered air can go into the blower.
My observations are consistent with what another user's review from early August 2025 is describing, and their photos clearly show the difference in width between the previous and new designs of the filter.
At the very least you should indicate clearly on the label that the filter is narrower than previously. I know you made 2 versions of a 16x25x4 in the past (regular and slim; the regular version fits my furnace). Are you now only making narrow versions?
My observations are consistent with what another user's review from early August 2025 is describing, and their photos clearly show the difference in width between the previous and new designs of the filter.
At the very least you should indicate clearly on the label that the filter is narrower than previously. I know you made 2 versions of a 16x25x4 in the past (regular and slim; the regular version fits my furnace). Are you now only making narrow versions?
Response from filtrete.comBy 3M-Filtrete Care Team, 3M-Filtrete, August 12, 2025
Hello, thank you for taking the time to leave your review. Your feedback is very important to us, and we will be sure to forward your comments. If you have any additional feedback or questions, please feel free to reach out to our team at 1-800-388-3458 Mo-Fri 8am-4:30pm CT.
Written by a customer while visiting filtrete.com
Customer Rating
5
Superlative
on December 26, 2022
Posted by: Pvrp
One word superlative this and 3M filters are manufactured for exceptional quality and performance.
Written by a customer while visiting filtrete.com
Customer Rating
5
Like it says!
on February 19, 2016
Posted by: lityouthministries
from Lafayette, TN, United States
Gender:Male
I love things that just work. You know; Do exactly what they're supposed to do. These filters do that. In the country, one cat, and clean fresh air. Not to mention clean and efficient work load for the central heat and AC unit. Thanks Filtrete
I would recommend this to a friend!
Written by a customer while visiting filtrete.com
Customer Rating
5
on February 23, 2016
Posted by: loudmouthlime
from Atlanta, GA, United States
Gender:Female
Agree with these reviews, excellent product for those with asthma. I have 2 dogs, and these filters do the job in controlling the hair and dander.
I would recommend this to a friend!
Written by a customer while visiting filtrete.com
Customer Rating
5
on March 1, 2016
Posted by: Marni
from Atlanta, GA, United States
Gender:Female
Since I started using this filter, I stopped getting sinus infections and suffer less from allergies! Great product. You can feel the effects of putting in a new air filter immediately.
I would recommend this to a friend!
Written by a customer while visiting filtrete.com