Special purpose horizontal sliding doors

[Sifu]

All relevant codes point to this being allowed, but I can't recall ever having one acting as a stair enclosure/opening and want to make sure. This is an exit stair in a 3 story, fully sprinklered type IB building. All levels use a WON door to provide an open stair under normal conditions, automatically closing under alarm conditions to provide a 2-hr enclosure. Most of my uncertainty comes from it being used as an exit access door by occupants needing to get in to the stairs when it closes under alarm conditions.

 

[steveray]

I am getting my first one soon and I asked and have been assured that the WonDoor will function for egress purposes....Time will tell...#23 of 136 on the plan review...

23. How was occupant loading in the memory support courtyard calculated? Egress may be an issue with the won-dor closed. Please explain.

 

[Sifu]

As far as I can tell if they criteria in 1010.1.4.3 they can be used, just never used one right in the stairway wall. I did witness some testing in a different location about 5 years ago and they met the criteria. I guess egress is egress.

 

[steveray]

707.3.2 Interior exit stairway and ramp construction. The fire-resistance rating of the fire barrier separating building areas from an interior exit stairway or ramp shall comply with Section 1023.1.
707.3.3 Enclosures for exit access stairways. The fireresistance rating of the fire barrier separating building areas from an exit access stairway or ramp shall comply with Section 713.4.

 

[Paul Sweet]

How does it meet 1010.1.2 Door Swing:
"Egress doors shall be of the pivoted or side-hinged swinging type."

I don't see where it meets any of the exceptions.

 

[Mr. Inspector]

1010.1.2 Door swing. Egress doors shall be of the pivoted
or side-hinged swinging type.
Exceptions:
1. Private garages, office areas, factory and storage
areas with an occupant load of 10 or less.
2. Group I-3 occupancies used as a place of detention.
3. Critical or intensive care patient rooms within
suites of health care facilities.
4. Doors within or serving a single dwelling unit in
Groups R-2 and R-3.
5. In other than Group H occupancies, revolving
doors complying with Section 1010.1.4.1.
6. In other than Group H occupancies, special purpose
horizontal sliding, accordion or folding door
assemblies complying with Section 1010.1.4.3.
7. Power-operated doors in accordance with Section
1010.1.4.2.
8. Doors serving a bathroom within an individual
sleeping unit in Group R-1.
9. In other than Group H occupancies, manually
operated horizontal sliding doors are permitted in
a means of egress f

 

[Paul Sweet]

Rick,
Thanks, I missed that exception.

 

[Sifu]

The most puzzling aspect in this case is that the elevators open to a space that is open to the interior exit stair if the door isn't deployed, but they don't technically open into the exit enclosure, so I am thinking it is permitted as long as the doors close upon alarm.

 

[ChrisCampbell]

I have used the won door product for exit enclosure openings in the past. Do you know which won door model you are using?