The inside trim piece is not connected to the outside except for (usually) 4 screws holding the trim in place. The outside metal vent frame is screwed to the roof substrate then the screws and metal flange are covered with sealant. So if you remove the inside screws it does not affect the vent frame and its mounting.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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