We live on a lease and plan on moving soon. The air vents had probably not been cleaned in twenty years. My partner found the mask in the bedroom. Rough. There is also a faint shepherd smell, even though the house had new carpet and fresh paint before we moved in. abominable. I had a sinus headache and after a few days I think these filters are helping, now really isn't the time to open the windows for fresh air. The filters seem a bit narrow so I applied two coats to get full coverage. These filters are fluffy, like thin Dacron, about 1/8 inch thick. I'm sure you can just wash them and hang dry if you want to replace them. them before the meanness really builds. I'd feel better if they seemed tighter, but the dust filtering seems to be working. The air quality in the house has definitely improved. I wouldn't trust them to filter real allergens. Let's say a dog for example... I still smell a German shepherd.
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