Two hinged doors occur in series in an accessible vestibule, and both swing into the space between them. What minimum separation rule is checked between the doors?
Correct Answer
D) 48 in. plus the width of doors swinging into the space
Accessible door criteria require doors in series to be separated by at least 48 in. plus the width of any door swinging into the space. Other choices reduce or overstate the required vestibule separation.
Why This Is the Correct Answer
Accessible door criteria require doors in series to be separated by at least 48 in. plus the width of any door swinging into the space. Other choices reduce or overstate the required vestibule separation.
Why the Other Options Are Wrong
Option A: 24 in. plus the width of doors swinging into the space
In doors, windows, and glazing, 24 in. plus the width of doors swinging into the space is the wrong selection for Doors in series: 24 in. plus the width of doors swinging into the space is an IBC dimensional value for a different stair, door, or egress condition.
Option B: 36 in. plus the width of doors swinging into the space
The trap in B is 36 in. plus the width of doors swinging into the space. That selection is wrong because 36 in. plus the width of doors swinging into the space is an IBC dimensional value for a different stair, door, or egress condition.
Option C: 60 in. plus the width of doors swinging into the space
Choice C gives 60 in. plus the width of doors swinging into the space. Its specific error: 60 in. plus the width of doors swinging into the space is an IBC dimensional value for a different stair, door, or egress condition.
Memory Technique
Make doors in series a tabbed card: cite the exact condition, then choose 48 in. plus the width of doors swinging into the space.
Reference Hint
Open ICC A117.1-2017 Accessible and Usable Buildings and Facilities; use ICC A117.1-2017 Section 404.2.6 doors in series to confirm that Accessible door criteria require doors in series to be separated by at least 48 in.
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