Two 36 in. wide hinged doors in series both swing into the vestibule space between them. Using the accessible separation rule, what minimum clear distance is required between the doors?
Correct Answer
D) 84 in.
Doors in series require 48 in. plus the width of doors swinging into the space. With one 36 in. door swing counted in the separation, 48 + 36 = 84 in. Other choices omit the door width, use a 24 in. door, or add two door widths for this stated condition.
Why This Is the Correct Answer
Doors in series require 48 in. plus the width of doors swinging into the space. With one 36 in. door swing counted in the separation, 48 + 36 = 84 in. Other choices omit the door width, use a 24 in. door, or add two door widths for this stated condition.
Why the Other Options Are Wrong
Option A: 48 in.
accessible vestibule depth, choice a: 48 in. stops after doors in series require 48 in.
Option B: 72 in.
accessible vestibule depth, choice b: 72 in. omits a required add-on/subtraction; the numeric gap is 12.
Option C: 96 in.
accessible vestibule depth, choice c: 96 in. adds an extra unstated add-on/subtraction; the numeric gap is 12.
Memory Technique
Picture a warning sign labeled accessible vestibule depth: finish every operation before accepting 84 in.
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 Doors in series require 48 in.
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