EXCEPTION: | Vestibules are not required for the following: |
1. Doors not intended to be used as building entrances. | |
2. Unfinished ground-level space greater than 3,000 square feet (298 m2) if a note is included on the permit documents at each exterior entrance to the space stating "Vestibule required at time of tenant build-out if entrance serves a space greater than 3,000 square feet in area." | |
3. Doors opening directly from a sleeping unit or dwelling unit. | |
4. Doors between an enclosed space smaller than 3,000 square feet (298 m2) in area and the exterior of the building or the building entrance lobby, where those doors do not comprise one of the primary building entrance paths to the remainder of the building. The space must be enclosed and separated without transfer air paths from the primary building entrance paths. If there are doors between the space and the primary entrance path, then the doors shall be equipped with self-closing devices so the space acts as a vestibule for the primary building entrance. | |
5. Revolving doors. | |
6. Doors used primarily to facilitate vehicular movement or material handling and adjacent personnel doors. | |
7. In buildings less than 3 stories above grade or in spaces that do not directly connect with the building elevator lobby, doors that have an air curtain with a velocity of not less than 6.56 feet per second (2 m/s) at the floor that have been tested in accordance with ANSI/AMCA 220 and installed in accordance with the manufacturer's instructions. Manual or automatic controls shall be provided that will operate the air curtain with the opening and closing of the door. Air curtains and their controls shall comply with Section C408.2.3. | |
8. Building entrances in buildings that are less than four stories above grade and less than 10,000 ft2 in area. | |
9. Elevator doors in parking garages provided that the elevators have an enclosed lobby at each level of the garage. | |
10. Entrances to semi-heated spaces. |