Clean air so far. We have a new system and it uses 2 inch filters. Two 1" filters stacked on top of each other won't work. This one will. A month has passed and I've noticed less headaches from things floating in the air. Yes, I understand allergic headaches are a combination of nature at work , and a small filter won't make it perfect.This made dusting less labor intensive.I will order again.I paid full price.
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