Bought this a month ago after having my unit replaced. I was suffering with severe allergies due to the ductwork and unit being replaced by a very sloppy company, so I decided to give it a shot (it had its work cut out for it) I am replacing it today. Usually lasts a lot longer but my home was contaminated severely due to the negligence of our ac repair company!

I did buy this a few months ago because I like to have them on hand when needed. I buy this even though the guy who worked on my furnace and replaced the blower motor said not to use these filters. He said they were the cause of the blower motor going out, because they would have to work to hard and need replaced. But these filters, I believe, do what they are suppose to. I have dog's and these filters help me breath better when the air conditioner for summer or heater for winter.

We live in the country, own a feedlot, have 3 kids and have 3 dogs. Needless to say, there is a lot of stuff in our air. My husband and 2 of our kids have respiratory issues. These filters have done a great job of keeping our system as clean as possible in this environment.

I have been using Filtrete filters to reduce the allergens in the air for the past 5 years. They have significantly reduced the particles in the air that had been causing my wife to have various allergic reactions, including coughing, watering and itching eyes and general difficulty breathing. I certainly will be continuing to use them from now on!

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 am on my second set of these filters to help clean the air of allergens/dust that harm my wife's breathing problems. These filters make her life better! they capture more of the things in the air than any other product I have used and have made her able to breather easier and better. I am convinced--and I will buy more of these!

After my electronic air filter system failed, I decided to to try the Filtrete Air Filter. (1550, 4"). I have been using it for the last four years. It seems to work every bit as as well as the expensive electronic system. I thought we would notice more dust in the house, but that is not the case!!

We used Filtrete furnace filters for years. A few months ago I made the mistake of being talked into trying a different brand because they were cheaper. What a mistake! The other brand jammed and bent when trying to insert it in the furnace and it simply didn't trap the dust like a Filtrete. Needless to say, we will only purchase Filterete brand filters in the future!

My family and I moved into our 2800 square foot house in Minnesota almost two years ago. The filter that was in the furnace was not a 3M Filtrete filter and it was disgusting. I bought this product because it was the only filter of this size offered at the store where I bought it. I thought it would be a good deal considering it said that it would last up to 12 months. I'm no dummy, I know that when something says that it'll last up to any amount of time, that time should be cut in half under "normal" Minnesota conditions. Cutting to the chase, this product doesn't even last 3 months, and that's in the fall when the furnace fan never runs! We even had our ducts cleaned before installing our last filter. The product definitely works because of all the "stuff" trapped in it, but for a product to have a label on it stating that it will last up to 12 months, it should at least last 6 month in Minnesota conditions. I would recommend this product to anyone, however I would have to warn them about the replacement period being so frequent.

The Filtrete 1550 Allergy Reduction filter does a remarkable job in filtering out the seasonal mountain allergens that blow into our North Central TX home. We use fewer antihistamines since we have installed the high efficiency filters. Thank you, 3M.