The lid of a MaxxFan Deluxe like # MA00-07500K is going to sit approximately 15mm (5/8") above the roof of the RV. There can be a bit of difference with this depending on the curvature of the roof so I measured from where the flange would sit when it's fully mounted.
If this doesn't work for your setup then I recommend the MaxxFan Mini Plus Manual RV Roof Vent w/ 12V Fan - LED Light - Black # MA00-03851 in its place since it has no overhang but still has a rain shield cover. I actually... view full answer...
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