(a) Respirators tested under this section shall be approved only when they supply respirable air at the pressures and quantities required.

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(b) The pressure at the inlet of the hose connection shall not exceed 863 kN/m.2 (125 pounds per square inch gage).

(c) Where the pressure at any point in the supply system exceeds 863 kN/m.2 (125 pounds per square inch gage), the respirator shall be equipped with a pressure-release mechanism that will prevent the pressure at the hose connection from exceeding 863 kN/m.2 (125 pounds per square inch gage) under any conditions.