By doing this you re ensuring extra strength for holding the roof vent in place.
How to replace rv roof vent.
The next step is to prepare the new roof vent for installation.
Next straighten out the tabs that go into the new vent and then put the tabs into the new roof vent.
Once you are home get back onto the ladder and remove the pins from the hinge of the old vent.
Straighten the tabs that go into the old vent and then take off the lid.
If you are replacing an existing vent remove the old trim ring garnish piece from inside the rv.
Remove old garnish or cut new opening.