We get the vent filters and will change them out once we need to put the furnace on and will change them out once a month or so...we have a cat and a bird and although the DW is constantly cleaning up after them "stuff" would still get down the vents.
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Les and Sue Young, 2009 Int 4400 LP, 2020 DRV Mobile Suites [/url] https://ramblingrvrat.blogspot.com/2019/11/freedom-from-grid-rambling-rv-rats.html[/url]
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