909.20.3.2 Vestibule doors.
BC § 909.20.3.2
Where access to the stairway or ramp is by way of a vestibule, the door assembly into the vestibule shall be a fire door assembly complying with Section 716.5. The door assembly from the vestibule to the stairway shall have not less than a 90-minute fire protection rating complying with Section 716.5.













