Hertfordshire fire and rescue service

The fire and rescue service is provided by Hertfordshire
County Council.
Smoke alarms can give you valuable extra seconds to escape
uninjured from a fire. They are available for just a few
pounds from most DIY, hardware and electrical shops. They should
display a Kitemark and British Standard number 5446 Part 1.
If you live in a flat or bungalow, one smoke alarm should be enough
to warn you of a fire and should be fitted in the hall, between the
living and sleeping areas. If your home has more than one floor,
fit one alarm at the bottom of the staircase and another on each
upstairs landing.
In addition, you can fit alarms in other rooms where fire may
start, such as the living room, but not in the kitchen or bathroom,
as cooking fumes or steam may cause them to sound.
When fitting an alarm, follow the manufacturer's instructions.
Alarms should usually be screwed into the ceiling at least 30
centimetres (12 inches) away from any wall or light fitting and as
close to the centre of the hall, landing or room ceiling as
possible.
Once they are installed, check the battery once a month by pressing
the test button. Once a year consideration should be given to
changing the battery and the inside of the alarm vacuumed to ensure
that the sensor is not being blocked by dust.
Remember - dial 999 in an emergency.