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3M Filtrete™ Ultra Allergen Re

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Price

Dust

Quality

Performance

Smell

Size

Furnace

Breath

Ease Of Installation

Cleaning

Value

Construction

Excellent air filter. I buy these 20x20x1 sizes and tape them to a regular box fan for a quick, easy, and affordable air filtration unit that I can move around the house wherever/whenever I want. No need for any special high end unit that requires a unique filter that some company stops supporting.

3M Filtrete Ultra Allergen Reduction 1500, 20x20x1

filtrete.com

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.

Traps Everything

I think these filters are pretty good!
I just wish I knew how to keep the dust out for a least a couple days! 😂

Filter

walmart.com

I love the Filtrete Filters. Last long. I can go be young the 3 months. I love that it's thinner and easier to fit. Great price as well.

Filtrete Filter

[This review was collected as part of a promotion.] My go to ! Super easy to put in, best preforming and doesn't fall apart! Works well with our unit! Makes our maintenance super easy my 8 years can do it !

Best ever

influenster.com

I had to return this item because it was the slim version of 20 x 25 x 4.  The picture does not show this but when I received it the package had a label in red that it was the slim version.  The title of the item should state that it is the slim version.  Walmart quickly took the return and I reordered the 2 pack which fit fine.  The slim is smaller all the way around but the width is 3.75 inches instead of 4.3 inches.

Picture misleading read the fine print.

I love the filter, but I received the thiner model which is not what I wanted.  Overall, it's a great filter for removing everything from dust to smoke

Great filter

3M-Filtrete Care Team

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.

16x20x4 does not fit Honeywell / Lennox filter box

[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?

Filter width changed without proper labeling

3M-Filtrete

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.

Undersized.   Not of advertised value.