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How long does a 4 inch furnace filter last?

Rules of thumbs are 1 inch filters change at least every three months if not sooner, 2 inch filters 4 months, 4 inch filters can last 6 to 8 months and 5 inch filters can last as long as a year depending on the quality. 50% of your filter is plugged in if you can see dirt on it.

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