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Domestic smoke detectors without alarm?

Discussion in 'Electrics UK' started by Ruggers, 10 Oct 2020.

  1. Ruggers

    Ruggers

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    Is it possible to buy smoke detectors that don't alarm but link up to the alarmed system.

    My existing home had to have 2 fitted to comply with the regs and zones, one in the hall one on the landing, but i added an additional two, to rooms with multiple appliances that pose a fire risk. When one is triggered, all 4 alarm so it's quite loud.

    I'm going to build a detached house and would like to have a few more, possibly 8 which might be overkill and would be loud. Thoughts were to have 4 installed in the hall, landing, utility room & whatever a kitchen requires. But then add a detector to each upstairs bedroom that doesn't alarm. The landing alarm would be enough to wake everyone.

    Is this possible?
     
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  3. JohnD

    JohnD

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    tell me the reason why it is an advantage to have fewer sounders when your house is on fire.

    My house has fire doors, which are quite good at blocking sound, and I had an extra sound bomb added on the landing ceiling.

    Sooner or later your house will contain someone who has been drinking, or has a heavy cold and blocked ears, or is a heavy sleeper, or a bit deaf, or a young child who may not wake when sound asleep.

    I had an elderly relation who was woken up by a fireman kicking her door open and running upstairs to shake her.
     
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  4. bernardgreen

    bernardgreen

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    Dead or ( temporary ) deaf......which is the better result of a fire......

    It is true that very loud alarms can increase the disorientation in the panic that can happen when evacuating a burning house without a prepared and practised evacuation plan.
     
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  5. Ruggers

    Ruggers

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    Always going to choose life over temporary deafness but i don't think there's a need for them all to be alarmed if theres a way around it.
    Once in a while ours have alarmed for 3 or 4 beeps in the night, closest being the landing which is central to all bedrooms and we sure knew about it. If need be i'll install alarmed in each room incase one of the doors is shut.
     
  6. crystal ball

    crystal ball

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    Why not fit a fire alarm panel?
     
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  7. Ruggers

    Ruggers

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    I may look into these in more detail. If it's over complicating the system I'll just stick with 7/8 alarmed detectors in the rooms.

    Need to check if it's advisable to instal some form of MVHR circuit breaker so it closes the vent system if the fire detectors alarm.
     
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  9. SimonH2

    SimonH2

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    In a home it would be pointless - especially with a typical MVHR system. Every MVHR I've seen aimed at domestic simply provides a source of fresh air and suck stale air out - with a heat exchanger to recover heat. The normal reason for shutting down the HVAC system in commercial premises is that they typically collect air from most of the building, mix some fresh in, and distribute it to most of the building. So if there's a fire, the HVAC system will suck the smoke up and rapidly distribute it to the whole of the building - which is generally not considered a good thing.
    While the idea of a good MVHR install is to supply fresh air to spaces like bedrooms, and suck stale (and damp) air from places like bathrooms, the actual air flow won't be such that it rapidly draws smoke from (e.g.) a bedroom towards (e.g.) the bathroom.
     
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  10. SFK

    SFK

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    To my alco I added their silencer button.
    When pressed Mutes all the alarms that are not exposed to smoke.
     
  11. sparkymarka

    sparkymarka

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    Menvier M12 or texecom exodus.....smoke alarms that you are looking for both connect to alarm systems...
     
  12. Ruggers

    Ruggers

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    My thoughts were that having a running MVHR system could provide extra supply to feed a fire, i understand how they work and any extracted smoke could only be dumped back outside, but i'm not sure if the amount of air supplied and extracted is significant enough to make a fire worse. Dampers seem over the top for a standard dwelling but a trip relay seemed like an ok idea. Getting out is always the most important.
     
  13. Ruggers

    Ruggers

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    Is this Aico? I looked on their site because it's what i have now. Where is the silencer button located, is it on one or all of the alarms on the ceiling, or an extra that you fit near an escape point?

    Are these to link up to a fire panel or can they be linked in the usual 3 core & earth method?
     
  14. SimonH2

    SimonH2

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    It connects either to the link cable (hardwired version) or to the radio network (radio version) depending on what combination of items you have. You fit them where it's practical and makes sense. Both have Test, Locate, and Silence switches.
    Test: equivalent of press the test button on each alarm
    Locate: Silences all but the alarm that triggered
    Silence: Silences all the alarms
     
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