Seems like an odd way to word the requirement. It means that if your obstruction is taller and extends above 80" above the finish floor, it's fine. But in the picture shown, I don't see how the head knocker risk would be reduced if the cabinet were 12" taller.1003.3.3 Horizontal Projections
Diagram
Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finished floor shall not project horizontally more than 4 inches (102 mm) into the circulation path
I agree. The label is visible on the jamb.I was thinking the open door may be a fire rated door
Not many people are 6'8" tall, the same as typical door openings.Seems like an odd way to word the requirement. It means that if your obstruction is taller and extends above 80" above the finish floor, it's fine. But in the picture shown, I don't see how the head knocker risk would be reduced if the cabinet were 12" taller.
I would have expected the requirement to be worded more like: between the elevations of 27" and 80" above the finished floor, objects may not project into the circulation path horizontally more than 4."
Cheers, Wayne
That observation doesn't address my criticism of 1003.3.3. My point is that if the top of the AED were 81" AFF, there would be no 1003.3.3 violation, despite it still being a head knocker.Not many people are 6'8" tall, the same as typical door openings.
No....because below 80" is more than 27"...I agree that is a little weird, but it works...Anything that is any part above 27 and/or below 80 needs to go below 27".....That observation doesn't address my criticism of 1003.3.3. My point is that if the top of the AED were 81" AFF, there would be no 1003.3.3 violation, despite it still being a head knocker.
I'm not familiar with Chapter 10 of the IBC, but looking at 1003.3, seems like 1003.3.1 second paragraph is also relevant:
"A barrier shall be provided where the vertical clearance above a circulation path is less than 80 inches (2032 mm) high above the finished floor. The leading edge of such a barrier shall be located 27 inches (686 mm) maximum above the finished floor."
But that section is also worded poorly, it needs to have an exception for the region within 4" from the wall to coordinate with 1003.3.3.
Cheers, Wayne
Mag hold open...but the detector may be more than 5' away I think is the number....oh the more you look...I was thinking the open door may be a fire rated door
You're going to have to explain what you mean, as you quoted several points of mine, so I'm unclear which point you are responding to.No....because below 80" is more than 27"...I agree that is a little weird, but it works...
Yes, the diagram is what I expected, but the wording of 10.3.3.3 does not properly cover the case illustrated below, which was my point in my first post in this thread.Best I can explain it...maybe...from ANSI which reads the same:
To me...what it says...: if it is anywhere, (any part of it) from> 27 to 80, then it needs to be 4" or less or needs to be stretched down to 27"....often we see cane barriers installed or put a piece of furniture under it...Surface mounted electrical panels sometimes bump up against this and they can frame under them to remediate....Yes, the diagram is what I expected, but the wording of 10.3.3.3 does not properly cover the case illustrated below, which was my point in my first post in this thread.
Also, the wording of 10.3.3.1 does not have the proper exclusion for the region within 4" of the walls. You can say that the vertical clearance under the obstacle on the wall is 30" (to make up a number, it is not called out in the diagram below), and so 10.3.3.1 says that there should be a barrier that extends down to 27" AFF. Which I assume is not intended to be required if the obstacle complies with 10.3.3.3.
Cheers, Wayne
View attachment 14078
That is what I would expect it to say, but that is not what it says.To me...what it says...: if it is anywhere, (any part of it) from> 27 to 80, then it needs to be 4" or less or needs to be stretched down to 27".