For years I used cheap blue fiberglass filters. Only my air conditioning is forced and I try not to use it that often. However, a few years ago I went to the attic to inspect the air handling unit and found that it was a bit dusty. I vacuumed it, cleaned the air duct, and then sprayed it with an air duct cleaner I found at a large store. I've been using Filtrete paper filters ever since. They do their job so well that I will be running a non-AC fan to circulate and clean the air. The filters do the job better than the cheap filters I've used in the past. After using it for a few years I went back to the attic to check out the air purifier and it was very clean. My air conditioner is very old, but these filters have not caused any problems in my system. At one point I even used filters with a higher MPR without any problems. Allergies aren't really a problem, but clean air never hurts! :) It's nice to order 6 at a time because I always forget to change them before it's hot enough to use the AC. The box they come in makes them easy to store in a closet and protects the filters from damage.
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