These are the manufacturer recommended filters. So I bought her. They work great and I change them every six months. I've found they work better if you lift the registers (metal grilles) in your house when you vacuum and use the vacuum attachment a few times a year. It's amazing how much dust, dog hair and just plain accidents get into these air ducts. I even grabbed the vacuum extension hose I bought for my dryer and used it to get further into the air ducts. I filled the vacuum cleaner. While the filters work great on their own, if you vacuum your canals from time to time, they really extend the lifespan.
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