B-1.1, r. 3 - Safety Code

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62. Signs bearing the indication or the international symbol “NO SMOKING” must be installed at a conspicuous place in filling plants at every entrance and point of transfer of propane. The letters must be red on a white background or black on a yellow background and be at least 100 mm high. The symbols must have a minimum diameter of 300 mm.
O.C. 877-2003, s. 1.