S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

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427. An explosives magazine shall be heated only by hot air. The capacity of the fan shall allow at least one change of air per hour. The heating element shall be located outside the magazine and the temperature of the hot air at its point of entry into the magazine shall be below 50º C (122º F).
O.C. 213-93, s. 427.