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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: Crazy idea - smoke alarm inside MVHR plenum?

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  1.  
    • CommentAuthorSwarm
    • CommentTimeSep 5th 2016
     
    I'm thinking of adding more smoke alarms, to bedrooms, a cupboard with server in etc. Then I thought, what about adding one inside the extract plenum for my MVHR. Then if by some remote case of a fire starting in a bathroom, the smoke would quite quickly find it's way into the plenum and trigger the alarm.

    Which will then alarm the others and shut down power to the MVHR.
    • CommentAuthorbarney
    • CommentTimeSep 5th 2016
     
    The detector will b constantly flushed by the airflow - typically you n the d a sampling unit that takes a proportion of the and introduces that to the detector chamber to give a signal

    Barney
    • CommentAuthorCWatters
    • CommentTimeSep 5th 2016 edited
     
    Does it matter if the detector is "flushed"? Once it triggers won't it will keep sounding until manually reset so does it matter if the smoke is flushed out? or do I misunderstand?
    • CommentAuthorbarney
    • CommentTimeSep 5th 2016
     
    It's the dilution - you need enough obscuration to trigger the alarm in the first place

    With mechanical extract it's easy to cut through a hot smoke layer and draw clean air from below the smoke

    Barney
    • CommentAuthorSwarm
    • CommentTimeSep 6th 2016
     
    If I can get a smoke alarm inside, I might do some testing with it partially covered and at lower flow rates. I'll report back.
    • CommentAuthorbarney
    • CommentTimeSep 6th 2016
     
    I wouldnt make any kind of demand on it - what are you using for smoke

    Barney
    • CommentAuthorsnyggapa
    • CommentTimeSep 6th 2016
     
    you may also find that the forced airflow furrs or clags up the sensor with dust, making it ineffective over time.

    Personally, I wouldn't do it
    • CommentAuthorMike1
    • CommentTimeSep 8th 2016
     
    Not a crazy idea if you use the right kit - for example https://www.notifierfiresystems.co.uk/product.asp?id=695

    ...but only for use as an additional layer of protection, not instead of a regular installation.
    •  
      CommentAuthorSteamyTea
    • CommentTimeSep 11th 2016
     
    Don't some fire alarms also detect thermal energy as well as smoke, they would not work well in a ducts.

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