Turn off the electricity to the RV and flip the master breaker to "off."
Go to the roof of the RV and unscrew the four retaining bolts on the ceiling vent. Go inside and make sure you have removed all screws from the fixture. Gently pry the bracket mounts from the inside and outside of the RV.
Scrape off any old caulking used on the brackets. Be gentle. Do not rip the RV ceiling vinyl while you scrape off the old caulk. Pull the three fan wires out from the ceiling on the vent. Typically, these have a red, white and yellow wire with a cap on each.
Align the fan to the vent on the roof of the RV. Push the mounting bracket over the fan, then go back inside the RV. Do not screw the retaining bolts in yet.
Pull the three fan wires down from the ceiling and twist and crimp them together with the RV wires. Match red to red, white to white and yellow to yellow. Add a wire cap to each set of connected wires and twist down until tight. Push the wires back into the ceiling and place the interior bracket over the vent.
Screw the retaining bolts into the vent fan bracket covers. Go onto the roof and seal around the brackets with the marine-based caulk. Go inside and caulk around the vent brackets. You now have a fan ready to go.
