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Ron,
I looked around inside there when I had it apart and didn't see any filter. I did look over the installation guide for the unit. It had a portion of the guide dedicated to using a non vented installation. In that case they moved the main fan position to blow forward and installed the optional filter on top by the grill. That may be what you are thinking about.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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