After reading this thread I decided to check the operation of the vent flapper on my new RV. Surprise...it's already broken. The movable door was hanging funny and when I released the holding tabs it just fell off. Really cheap plastic stuff.
Going to Lowes when they open tomorrow and get a couple of metal hinges and make an attempt at fixing it.
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.
Vengeance 25V (the Harley needed a home)