I am asthmatic so CLEAN AIR is not a low end necessity for me - it is a HIGH END necessity. I am very happy with my indoor air quality and knowing that I am able to stay healthier with cleaner air is double payback. I share with all people I come in contact with that what type of house air filter you use to clean your air DOES matter.

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.

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.

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!

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.

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 use these in place of regular HVAC filters. The 4" depth adds surface are which reduces air flow resistance. My home systems for people with breathing problems includes multiple 20 x 20 x 4 inch filters. My 2400 sq ft home has 5 filters. The efficiency of the HVAC system is not degraded yet the air is best for sufferers of breathing problems such as asthma, RADS, or allergies.

I have started using these filters because of my severe allergies that hit me every summer. This past summer I thought would be a bad allergy season because of all the rain we had earlier in the spring. However I actually felt better all summer and it has to be because of the Filtrete filters that I have stared using. You have a customer for life.

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!

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?