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    teddy1959 Posts: 1, Reputation: 1
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    Mar 12, 2012, 12:53 PM
    Sears 600 wall gas furnace
    It's very old, but works. I need to know if it uses filters. The vents on the bottom of the unit that goes from the top to the bottom of the wall are very dirty. This leads me to believe that it uses filters. The owner said no, but then why are they so dirty?

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