I know that every electric motor produces some ozone, it's unavoidable. Most of the time I don't notice it. We had a Honeywell HEPA room air purifier (basically a fan which pulls in room air through a ...
I bought this air purifier and was installing the pre-filter that came with it. The instructions go "Carefully wrap the pre-filter around the HEPA filter so that the ends meet. Fasten the ends ...