My stepson had a vent leaking on the side of his trailer. I think it was built in '95 or '96. Basically it is an exterior vent that resembles a dryer vent. On the inside of the wall is a 3" round vent. Both have flaps to keep out the cold air. The electric furnace is directly across the hall from the vent.

I replaced it with a standard dryer vent which is slightly smaller on the outside although the part that goes into the wall was slightly larger. It wasn't as easy as I expected but at least the rain shouldn't come in thru the vent now. I don't know why my wife and her kids think duct tape fixes everything

I thought maybe it could be a fresh air vent if the MH had gas heat but the flaps would prevent air from being sucked inside

 

draft tube ?

thats nuthin. my MIL thinks that if a problem is ignored, it will just go away.

 

It could be an air equalization vent. Storms are at low pressure and will suck air from a house. A mobile home is pretty airtight from the factory, so it could be to allow the air pressure to equalize in a storm.....not a tornado, mind you...all bets are off.

 

That makes sense

You mean a trailer isn't tornado proof.... who would have thought