These filters are great. They make the air smell cleaner and trap pet hair and dust better than regular filters. I have been using these filters for several years now and I would not use anything else.
Using the best Filtrete filter for one of my tenants that smoked, I would show her the blackened Filtrete furnace filter when I would replace it. After the fifth replacement filter, she realized how her smoke was not only blackening the Filtrete furnace filters but also her lungs. She quit smoking thanks to Filtrete.
I have had both allergy and asthma problems and considered installing an electrostatic air filter in my hot air heating and cooling system.My supplier advised using your filtrete filter as a more practical solution to my air quality problems. I'm happy to say that I followed his advice and have been using filtrete for more than 6 years; I feel they have helped considerably in controlling my asthma and allergy problems.