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Thread: Fire alarm smoke detectors in multi level ceilings

  1. #1
    Join Date
    Dec 2015
    Location
    Ankara, Turkey
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    32

    Fire alarm smoke detectors in multi level ceilings

    Hi!

    We're designing a lobby where the ceiling is multi level. There are pools for hidden lights. The lowest level of ceiling is at +4.55 AFF. Then there is a higher area in the middle which is at +8.30 AFF.
    The detectors on the lowest level of the ceiling do provide the required coverage. Do I then need to install smoke detectors on the higher levels (+8.30 AFF) of the ceilings?

    I have attached a reference plan and a section so it is easier to understand.

    Thanks all!
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  2. #2
    Join Date
    May 2012
    Location
    Amissville, Virginia USA
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    202
    Quote Originally Posted by Gilf View Post
    Hi!

    We're designing a lobby where the ceiling is multi level. There are pools for hidden lights. The lowest level of ceiling is at +4.55 AFF. Then there is a higher area in the middle which is at +8.30 AFF.
    The detectors on the lowest level of the ceiling do provide the required coverage. Do I then need to install smoke detectors on the higher levels (+8.30 AFF) of the ceilings?

    I have attached a reference plan and a section so it is easier to understand.

    Thanks all!
    Where is the smoke most likely to go? Hot air rises. Try to get installation instructions for the brand you are using. They have alot of good information that will help you.

    Sent from my SM-T350 using Tapatalk

  3. #3
    Join Date
    Jun 2003
    Posts
    6,759
    NFPA 72 has lots of info. about installing detectors on ceilings with various levels, pockets, beams, headers, etc.

  4. #4
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    4,873
    Quote Originally Posted by Gilf View Post
    Hi!

    We're designing a lobby where the ceiling is multi level. There are pools for hidden lights. The lowest level of ceiling is at +4.55 AFF. Then there is a higher area in the middle which is at +8.30 AFF.
    The detectors on the lowest level of the ceiling do provide the required coverage. Do I then need to install smoke detectors on the higher levels (+8.30 AFF) of the ceilings?

    I have attached a reference plan and a section so it is easier to understand.

    Thanks all!
    I assume the ceiling heights are in meters? Just to clarify for us metrically-challenged Americans.

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