sounders

[bg1]

I understand that the sounder need to be a certain level at bed head but does the fire alarm need to be at a certain db outside of a building ?

 

Many thanks

[AnthonyB]

Not externally (in fact external sounders must silence after 30 minutes just like intruder systems) unless there is an open area part of the building like a roof terrace. Visual Alarm Devices may be appropriate as well.