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Magnetic door holder

We only require release upon certain milestones of the fire alarm system. What is the reasoning behind the requirement in NFPA 101? encase of a device malfunction?
 
NFPA advocates for automatic-closing fire doors to be closed when the building is not occupied, in case something goes wrong. I think that's the purpose of the requirement for closing the doors manually instead of only upon fire alarm.
 
OK, so in Canada, CAN/ULC-S524, the standard on fire alarms, requires some detectors located adjacent to these doors. The annunciator must release these doors when the smoke detectors are tripped (among other things). Is this not a requirement of NFPA 72? It just doesn't make sense to me why the doors would need to closed manually if the fire alarm system is going to do it anyway. Am I missing something?
 
tmurray said:
OK, so in Canada, CAN/ULC-S524, the standard on fire alarms, requires some detectors located adjacent to these doors. The annunciator must release these doors when the smoke detectors are tripped (among other things). Is this not a requirement of NFPA 72? It just doesn't make sense to me why the doors would need to closed manually if the fire alarm system is going to do it anyway. Am I missing something?
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Yes NFPA 72 requires detectors


I could see the manual requirement maybe used more in a hospital or nursing home setting.

Where 101 is used and a practice to have doors open, with a requirement for staff to close them.

Plus, it does take smoke in the area for automatic operation, so kind of same if in other than medical setting people might make it a practice to manually close the doors.

Or, as an inspector just walking through on an inspection, I want to see the doors close properly and latch.
So I pull on the door to release it.
If to much magnet power, you can almost pull the holder off the wall, leaving a nice hole
 
LGreene said:
I'm not sure what the question is here...the original question was about magnetic hold-opens but now it seems like the topic has moved to electromagnetic locks.
Click to expand...

I think they might be a spammer...all their posts are kind of weird.
 
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Thread resurrection. Need a little Mag Holder expertise. Current door is held open with a mag holder installed in a piece of cabinetry. New plan calls for the cabinetry to be redesigned and the mag holder is no longer wanted to be integrated. We can place it in the wall but this wall section only extends about 18" from the hinge. This places the mag holder device about 14" or so from the hinge rather than 30" or so in it's current configuration.

Will the mag holder be able to hold the door open with this reduced dimension? are there stronger holders? increase voltage to device?
 
cda said:
Lori keeps coming up with stuff you hardly see, or never think about.
So in this one the questions is magnetic door holder, and force required to manually release one.

Is there language in IBC on force to manually release a magnetic door holder???


http://idighardware.com/2017/02/qq-holding-force-for-automatic-closing-doors/
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That linked article makes no sense. The standard it cites lists the release force in lbf -- foot-pounds. But foot-pounds is a measure of torque, not linear pulling resistance/force.

I would be more inclined to look at the door hardware requirements in chapter 10 of the IBC.

1010.1.3 Forces to unlatch and open doors. The forces to
unlatch doors shall comply with the following:

1. Where door hardware operates by push or pull, the
operational force to unlatch the door shall not exceed
15 pounds (67 N).

...

The force to open doors shall comply with the following:

1. For interior swinging egress doors that are manually
operated, other than doors required to be fire rated, the
force for pushing or pulling open the door shall not
exceed 5 pounds (22 N).

2. For other swinging doors, sliding doors or folding
doors, and doors required to be fire rated, the door shall
require not more than a 30-pound (133 N) force to be
set in motion and shall move to a full-open position
when subjected to not more than a 15-pound (67 N)
force.
Click to expand...

If the force needed to open a fire-rated door can't exceed 30 pounds, I think it's reasonable to apply the same limit to the force needed to release the door from a magnetic hold-open.
 
The magnetic fire door retainers can also be manually released via a push button.
zero pounds.....
 
This was a thread resurrection from 2017. I placed my question here because it had to do with hold opens. But different ? completely
 
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