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I have had a hepa filter in my bedroom for the past 10 years. I'm on my third model. This one is a honywell rated for a room that is about 4X the size of my bedroom. You are supposed to get one that can change all the air in the room at least 6 times per hour. By getting one that is significantly oversized I can keep it on low which is very quiet and still maintain the 6X/hour number.
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