You dont give enuff info. Is it ducted? is it in a tt/5th/slide-in? What make?
In my old tt (hardside pop-up), the duct side had to be disconnected & there were braces. In the "new" one (Coachman 97), I can get the motor out from the outside. It took some work to do it, but was easier than redoing all the sealing around the outside & the ducting inside. This is on a Thermoflame (?) or such.
SOTSU!!
\\BF//