On my 36 TK3 the fan blades just barely cleared the slide out as it came in. Lowering the blades any on my rig would never had worked. I did alter the blades a bit by using washers under one edge of the mounting unit to give the blades a bit more arch and some air movement.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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