Revain didn't have my regular breather filter so I bought this. Bad mistake. I actually install this on my convector vents. I live in an old house and ventilation is connected to each apartment. Therefore, dust tends to get inside when the air is turned on. I put velcro over the vents and place this type of filter on top for extra dust protection. I usually change every two weeks. It was so thin and fragile and broke so easily. I'll probably have to change that every week.
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