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1014.3 Boiler, Furnace and Incinerator Rooms
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Two exit access doorways are required in boiler, furnace and incinerator rooms where the area is over 500 square feet (46 m2 ) and any fuel-fired equipment exceeds 400,000 British thermal units (Btu) (422000 KJ) input capacity. Where two exit access doorways are required, one is permitted to be a fixed ladder or an alternating tread device. Exit access doorways shall be separated by a horizontal distance equal to one-half the maximum horizontal dimension of the room.