Even if they have a vent at the bottom of the box inside, as a safety measure to the main vent's blockage, the door venting could be better located towards the bottom. Propane is heavier than air, right?
Yes, but in reality no. This is a standard "RV" propane door with the louvers on top facing down that has more surface area then all of my other campers combined. If you take a trip to the camper store you will find many (if not most) campers dont use propane vented doors anymore probably because they are more expensive than normal baggage doors. FWC still does and I think it is a good idea to have door venting and also satisfies most RV laws. Im sure there is a law about how many square inches of venting a propane compartment must have. In my experience, most campers use a baggage door with a small plastic vent cut out on the inside. My FWC door had 3 times the venting then my buddy's brand new Lance slide in's plastic mounted vent. My other 2 pull behind campers have exterior bottles.
Yes, in theory, a second vent in case a large squirrel, groundhog or some animal of that size somehow managed blocked the door vents and ate through the propane lines at night without waking me up, another vent would helpful. The only feasible scenario for myself that I can see the door vent plugging up would be if I backed into a snowbank. But, I wouldn't be able to use the camper door if I did that. Have you ever plugged up a louvered vent that is around 1/2 square foot of surface area? Bee's nest plugging the door maybe?
That being said, I am adding a floor drain to my propane box to mitigate the squirrel death scenario, and add the ability to hose out the massive amounts of dust that accumulate on the back of vehicles on those long dusty northern haul roads I like to travel.
