A 36 in. nominal swinging door is installed in a frame where stops and door thickness reduce clear opening by 3-1/2 in. when open 90 degrees. What clear opening remains?
Correct Answer
C) 32-1/2 in.
Clear opening is 36 - 3.5 = 32.5 in., which is 32-1/2 in. Other choices subtract too much, use a rounded reduction, or ignore part of the stop and door thickness reduction.
Why This Is the Correct Answer
Clear opening is 36 - 3.5 = 32.5 in., which is 32-1/2 in. Other choices subtract too much, use a rounded reduction, or ignore part of the stop and door thickness reduction.
Why the Other Options Are Wrong
Option A: 30-1/2 in.
door leaf clearance, choice a: 90 / 3 gives 30-1/2 in. That calculation follows divides those two listed numbers.
Option B: 31 in.
door leaf clearance, choice b: 31 in. backs into 62 when divided by 1/2; the accepted setup gives 64 on that same base.
Option D: 33 in.
door leaf clearance, choice d: 33 in. is produced by 36 - 3. The error is using that partial/alternate setup instead of Clear opening is 36 - 3.5 = 32.5 in. which is 32-1/2 in.
Memory Technique
Say the door leaf clearance rule aloud as a chain; the chain ends at 32-1/2 in., not an intermediate stop.
Reference Hint
Open ICC A117.1-2017 Accessible and Usable Buildings and Facilities; use the index entry or section for "ICC A117.1-2017 clear opening measurement at doors" to confirm that Clear opening is 36 - 3.5 = 32.5 in., which is 32-1/2 in.
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