We live in the worse smog in the country, Bakersfield, CA and since they say the air is worse inside your house we buy better filters. No, complaints.

My recommend filter is Lennox X6670 16”x25”x5” I tried this one 16”x25”x4” and it actually fit perfect. The exact dimensions I got for both are very similar alike and tried it out and it worked.

the physical dimensions are > 4", actually close to about 4.5". Be sure you're housing will accommodate 4.5" before purchasing. Can't comment on the function because these would not fit.

[Employee of 3m-filtrete] I am fairly diligent in changing the air filter in pur home. The amount of dust that is filtered out of the air is amazing. Thanks for this great product.

Sadness that all the sizes are not offered.

I have been using this filter with my carrier furnace/AC for the past 10 years. It works well for me

Didn't realize how dirty our air was. I'm glad these filters are trapping all of this "stuff" before it can circulate throughout the house.

I bought these a year ago buy the unit (6). I love the way they work taking everything bad out of my air in the house.

I just bought this today and I'm already breathing better. I have allergies bad and have pets this products is amazing

We are amazed when we replace the filter and see how much dirt was collected. We change our filter every 6 months!