Good filter. Although it is advertised as lasting up to 12 months, I feel the need to replace it every 2-3 months. I have a VERY difficult time removing it from air cleaner, as there are no holes in the filter in which to insert your fingers to grab it for removal. A simple design change would make it more user-friendly. I've found that I have to use a knife to cut a hole in the filter cardboard to have something to hold on to. Also, the cardboard strips on the sides usually get caught in my air cleaner, so as I'm removing the filter, I really have to pull hard, tearing the side strips, as I remove the filter.

We've been using The Filtrete Allergen Reduction filter #12 for about 6 months now and it does seem to be helping us with our allergies by cutting the amt. of allergens in the house. The Filter also fits perfectly so there is no noise from an ill fitting filter...we've had this problem in the past, but not at all with Filtrete. The dimensions are exactly what they state. Excellent filter. High recommend it.

I have used Filtrete filters for years! The 4" filter fits inside the frame of a disconnected electronic filter system that was always problematic. Filtrete filters perform better than the electronic system ever did and provide a superior return on my investment.

I decided to up spend on this filter and glad I did. I feel a piece of mind knowing this filter is on the job filtering the air thru my 4 bedrooms and 2 bathrooms on the upper level. Will re-purchase when I get the automatic reminder telling me its time.

Outside, air quality was 300-1100 (off-the-scale and very hazardous) with smoke hanging in the air like dense fog. Inside, the indoor air quality monitor says the air is very clean (AQI 23). This is with running the furnace fan continuously and changing filters every 3-4 weeks. The only downside is the smart filter feature doesn't actually know when the filters are dirty, only how much air volume has gone through them.

Filter says 16x25x4 but it is actually 4.25 thick! Does not fit in my furnace which is exactly 4.0" This is an extremely frustrating problem and every store carries the new 4.25 filter and apparently nobody makes or carries the old 3.75's anymore. I could cram a 4" in there but not one thats 4.25. Trust me, I tried.

Upon advice from my doctor to purchase a better a/c filter, I researched and purchased two of these. We quickly noticed a difference in the air quality, my headaches and sneezing are much better now. I am allergic to dust mites and my cats dander - I am extremely impressed. When I clean, there is far less dust accumulated on surfaces in my house which is lovely. After changing the filter recently we found out why - this filter is blocking everything. So great! We are considering investing in higher grades of the Filtrete brand because this one has done so well.

Finally found a filter to fit the huge furnace currently outfitted for "electromagnet" filtering. Because I don't use this type of system, I wanted a high quality air filter and Filtrete met the criteria. This is the second filter for me and I love the ease of installing. One question: I am an avid recycler and not sure how to recycle my used filters. Any thoughts?

I have been using the basic flat filters for several years. I always thought that as long as I changed or cleaned them every month they were just as good as the more expensive "Allergen Reduction" filters. Boy was I wrong. I decided to try a Filtrete Allergen Reduction filter because my eyes were constantly irritated and itchy, and on wet humid days I could smell that "wet dog" smell more often. I've been using the model 1200 filter for just over two months, and my eyes are not itchy and there has been NO wet dog smell. I have been very happy with this purchase; just wish I had tried them many years ago.

I bought the 4" filters for the first time in the fall. It is worth the price difference. My unit is up in the attic so getting up in the attic is a pain. Now I only need to change the filter every 3 months and it really helps with the dust in the air.. The air quality in our home has really improved.