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Old 04-07-2009, 09:04 PM   #1
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Default Smoke Detector clearance

How far away from a AC supply does a smoke detrector in a ceiling need to be? I have always thought it was 3', cant remember.

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Old 04-07-2009, 09:05 PM   #2
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yes 3 feet

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Old 04-07-2009, 09:10 PM   #3
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yes 3 feet
You are quick on the draw RB.
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Old 04-07-2009, 09:17 PM   #4
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just came across the post 1 min after you made it...lol
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Old 05-03-2009, 07:48 PM   #5
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It would be nice to stay 3' away if you think it will effect the operation of the detector, but there is no code requirement. The 3' distance is only found in the annex of NFPA 72.
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Old 05-03-2009, 08:07 PM   #6
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but there is no code requirement. The 3' distance is only found in the annex of NFPA 72.
How about 110.3 (B)
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Old 05-03-2009, 08:07 PM   #7
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How far away from a AC supply does a smoke detrector in a ceiling need to be? I have always thought it was 3', cant remember.
I say 0' from the supply but 3' from the return air. At least that is what I thought but maybe from both. Never put one next to a supply grill.

Edit: Apparently NFPA 11.8.3.5 states from the supply grill- 36". Also 36" from ceiling fans- alot I didn't know in this section.

Last edited by Mac Hine; 05-03-2009 at 08:30 PM. Reason: To correct myself
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Old 05-03-2009, 08:08 PM   #8
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Welcome to the forum RonS.
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Old 05-03-2009, 08:17 PM   #9
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William,
If it's in the instructions, then you are stuck with it ... you are correct.
Many detector instructions that I look at direct the installer to NFPA 72.
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Old 05-03-2009, 11:05 PM   #10
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ive done FA for a while, it is 3 feet min away, trust me..doesnt have anything to do with returns.. duct detectors are placed in the returns on larger units, sometimes even the supply. its FA code

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