Today I’m doing a project that has waited for too long, changing the bathroom vent and fan. My old fan blades were falling apart! So without further ado, here is how I did it:
Remove the collar from the inside by removing the four screws. Once the collar is removed, disconnect the two power wires and cap the live wires.
NOTE: Save the old collar! Chances are, the new collar that came with your new fan will NOT fit!
Remove the SCREWS first! By removing the screws first, it will make it much easier to remove the old lap sealant.
Step 3) With a plastic scraper, remove all the old lap sealant and butyl tape from the rubber roof. Be careful to only use the scraper in the direction of the old vent. In other words, work from the outside in. It takes a LOT of time and patience to remove all the old sealer. Mineral spirits will help.
Step 4) Apply the new butyl tape to the bottom of the new fan. Make sure the tape overlaps in the corners!
Place the new fan into the opening. Make SURE the side that opens is facing the rear of the RV! Next go inside and attach the power wires and replace the old collar. I do the inside work first, this way I know the inside collar will fit properly and the screw holes line up. Test the fan…
After the test, and finishing the inside work, return to the roof and apply all the NEW screws. Do not make them too tight as to bend the metal!
Step 5) Using DYCOR self leveling lap sealant, put a thick bead of sealant around the entire edge of the new fan housing, making sure to cover all the screws as well!
The finished product should look something like this:
After a few hours, the sealant will level out. It is VERY important that you do this job in the MORNING on a nice sunny day. The sun will help the sealant spread out and set. You should have at least four hours of direct sunlight after you have finished sealing.
I figured since I was already on the roof I would also change the black tank vent. Same procedure as above. I opted for the cyclone vent to draw out the smell with the wind.
Very easy to install… Happy tinkering!!
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