Changing the roof vent

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:

Step 1)
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!

Step 2)
Remove the SCREWS first! By removing the screws first, it will make it much easier to remove the old lap sealant.

Remove screws
Remove screws

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!

Tape overlap
Tape overlap

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…

Fan Wired
Fan Wired
Reused Old Collar
Reused Old Collar

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!

Dycor self leveling sealant
Dycor self leveling sealant

The finished product should look something like this:

Finished, sealed vent
Finished, sealed vent

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.

New Black Tank Cyclone Vent
New Black Tank Cyclone Vent

Very easy to install… Happy tinkering!!

For those looking for the fan kit I used, follow This Link.
If you’re looking for the cyclone vent, follow This Link.

*Both links are Amazon affiliate links BUT will not cost you a penny more; the commission helps pay for this website!

PLEASE ASK ANY QUESTIONS OR MAKE A COMMENT BELOW! I LOOK FORWARD TO HEARING FROM YOU!

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