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Old 01-08-2020, 06:54 PM   #1
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Default NFPA 72 - Beam Pockets above Suspended ceiling

Working in Nassau county, NY where we are designing for Above Ceiling smoke detectors where the ceiling above has beam pockets.

My question is when the NFPA references ceiling height, is it the height above the drop ceiling or the height above finished floor. It mentions that when installing devices above a suspended ceiling it should be treated as a seperate room. But it doesn't mention anything about where to take the ceiling height reference from in that scenario.

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Old 01-08-2020, 08:37 PM   #2
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The drop ceiling is ceiling height. The clue is "above suspended ceiling". What's a spoke detector?
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Old 01-08-2020, 09:03 PM   #3
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Originally Posted by joebanana View Post
What's a spoke detector?
It's a deal they use when manufacturing bicycle, motorcycle and similar wheels.

Not sure what bike wheels have to do with drop ceilings though....?
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Old 01-08-2020, 09:16 PM   #4
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Very funny.

It's most certainly not the drop ceiling height.

What I am trying to determine is, if it is the ceiling/deck height above the suspended ceiling or above the finished floor.
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Old 01-08-2020, 11:42 PM   #5
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Originally Posted by NJWVUGrad View Post
Very funny.

It's most certainly not the drop ceiling height.

What I am trying to determine is, if it is the ceiling/deck height above the suspended ceiling or above the finished floor.
Typically, ceiling height is measured from floor to underside of the roof. Clear ceiling height is from floor to lowest hanging object from the ceiling. ie. drop ceiling. 9 feet is standard. Room height is from floor to hard lid. What does it say about plenum ceilings?
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Old 01-08-2020, 11:54 PM   #6
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It's a deal they use when manufacturing bicycle, motorcycle and similar wheels.

Not sure what bike wheels have to do with drop ceilings though....?
Apparently, he mis-spoke, now it's a "smoke detector". Not sure what that has to do with bike tires, either??
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Old 01-09-2020, 10:33 AM   #7
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Quote:
Originally Posted by NJWVUGrad View Post
Working in Nassau county, NY where we are designing for Above Ceiling smoke detectors where the ceiling above has beam pockets.

My question is when the NFPA references ceiling height, is it the height above the drop ceiling or the height above finished floor. It mentions that when installing devices above a suspended ceiling it should be treated as a seperate room. But it doesn't mention anything about where to take the ceiling height reference from in that scenario.
Ceiling height is deck to ceiling (ie drop ceiling).

YES the space above the drop ceiling is a separate area, not having common air flow with the space below the ceiling unless it's used as a return plenum.

***Were you in a panic? I see this is posted like in several forums?
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Old 01-09-2020, 01:18 PM   #8
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Speak,

unless

Spoke n too,...
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