B-1.1, r. 3 - Safety Code

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51. Vehicles equipped with a propane appliance must not be parked or stored inside a building, except if
(1)  the propane storage cylinders are removed; or
(2)  the propane tanks have contents in propane of no more than 50% of the maximum filling capacity allowed and all shut-off valves are closed.
O.C. 877-2003, s. 1.