The Coal and Other Mines (Ventilation) Order 1956

22.—(1) In every road which is required for the working of a mine and which is a connection between—

(a) a main intake airway and a main return airway; or

(b) airways which as regards any working face are intake and return airways and in either of which the quantity of air passing any point is required to be measured under regulation nine;

there shall be provided and properly maintained at least two suitable doors to minimise the leakage of air, or, if in any case it is impracticable to provide such doors, other suitable means of minimising such leakage.

(2) In any other road the ventilation in which is to be restricted by means of any door or sheet for the purpose of preventing short-circuiting of an air current, there shall be provided and properly maintained at least two doors or, if that is impracticable, at least one door and one sheet or two sheets.

(3) Doors and sheets provided in pursuance of this regulation shall be so spaced that whenever one door or sheet is opened at least one other door or sheet provided for restricting the passing of air can be kept shut, or, if in any case it is impracticable so to space such doors and sheets, other measures to minimise the leakage of air through them shall be taken.

(4) Doors provided in pursuance of this regulation shall be self-closing. No person shall prop or fix such a door open except where and for so long as it is necessary to allow a vehicle to pass through it. Any such door when not in use shall be taken off its hinges and placed in a position in which it will not obstruct the air current.

(5) Any person who opens any such door shall secure that it is closed as soon as possible.