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Fire shields must have an opening sash having a clear area not less than one-half the area of the exit doors leading from the buildings to the vestibule or balcony and must be located not less than four feet (1219 mm) above the floor and not more than six inches (152 mm) below the ceiling of the vestibule or balcony, arranged to open automatically in case of fire to the full limit and to be held securely in such open position. Provision must be made for the manual opening or closing of the sash.
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