We lost the door in our vent, it was my fault as I did not lock it down for travel but it is so high on the trailer that you have to drag out a ladder to reach it. After loosing the door while here in Texas where the winds blow nearly all the time we kept getting dust and sand blowing in through the vent and covering the cooktop so I got some 00 steel wool and stuffed two peices up into the outside of the vent, not sure if the draft coming in through the vent is any better or not but at least I have no dust or sand on the cooktop.
Don