This roof vent exhausts any mugginess inside your RV or camper after you take a shower or cook a family dinner. You can manually open the vent when you need fresh air - and be happy that there is 1 less remote that you need to keep track of.
In these days of customer "no service" I am usually disapointed when doing business with people I don't know. It was refreshing doing business with you. I'm impressed!