Bought two of these due to price and difficulty finding the right size filter for my HVAC system locally. Within two months I noticed that I had problems with my sinuses. I thought I just had a virus or something but there were no other symptoms. I was on vacation for two weeks and all the symptoms disappeared. Came back to our house and the symptoms started again. Replaced this filter with a Filtrete filter which allowed me to find the right size. The symptoms have completely disappeared. Throw this filter away and unused.
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