mlts22 wrote:
Are we meaning propane tanks that are permanently mounted under a vehicle (which can/do vent), or propane cylinders (which are vented, but are portable)?
The propane cylinders I see in fifth wheels and motor homes almost always have venting, especially on the bottom (as propane is heavier than air.)
I had a neighbor next to me in the storage facility who's just filled tank vented and the spring shattered, venting the entire (at least) 40G tank out FAST. Conditions couldn't be worse... warm day and dead air. And there is nothing you can do to stop it.