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I think he is referring to the older style vent fans that just vent into the attic space--nothing on the roof involved. Believe the newer units have the FF type fans in the bathroom area.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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