Loft Conversion

Bedroom Landing Bedroom

Garage

Living Room Hallway Kitchen

 

 

AVERAGE TWO STOREY HOUSE

Optical or ionisation smoke alarm as best suited for the particular circumstances Optical smoke alarm

Smoke or heat alarm as best suited for the particular circumstances Heat alarm

Do not install smoke or heat alarms in bathrooms, shower rooms or toilets

SITING OF SMOKE ALARMS

Positioning of Smoke

Alarms:

There are a number of factors one has to take into consideration when positioning and maintaining a smoke alarm. The design and occupation of the premises will obviously be one of the influencing factors in deciding where to position the units as well as the likely types of fire and also the maintenance required. There are, however, some general guidelines that apply to all smoke alarms.

Ceiling Mounting:

Hot smoke rises and spreads out so a central ceiling position is the preferred location. The air in corners is “dead” and does not move, therefore smoke alarms must be mounted away from corners and walls. Place the alarm at least 300mm from any light fitting or decorative object that might

 

x P

 

x

 

x

P x

x

x

 

Siting alarms in hallways and landings

PCorrect ceiling siting position for alarms

xDo not install alarms here

How you position smoke alarms can be as important as choosing the right type of alarm to use.

As a minimum, a typical bungalow would need at least one alarm, a two storey dwelling two alarms and so forth.

In all Category LD systems, at least one smoke alarm should be located between the sleeping areas and the most likely source of fire - the living room and kitchen.

In a single storey dwelling with one alarm, the alarm should be placed as close as possible to the living accommodation, but consideration must be given to audibility in the bedroom. To achieve audibility of 85dB(A) at the bedroom doorway, alarms should be sited within 3m of bedroom doors.

In a multi-storey house, at least one smoke alarm should be located on the ground floor between the staircase and any room in which a fire is liable to start. A smoke alarm should also be installed on each main landing. In LD2 and LD1 systems, additional alarms need to be provided.

obstruct smoke entering the smoke alarm.

On a Sloping Ceiling:

In areas with sloping or peaked ceilings install the smoke alarm 900mm from the highest point measured horizontally, because “dead” air at the apex may prevent smoke reaching the unit.

Positioning Heat Alarms:

A heat alarm must be placed on the ceiling, preferably in the centre, or close to the likely source of fire. Air within the corners is dead and so heat alarms should be placed away from any corners. The alarms should be placed at least 300mm from any light fitting or decorative object that might obstruct the heat travelling to the sensor. Interconnection with smoke alarms is essential.

Spacing recommendations say that, under flat horizontal type ceilings, the horizontal distance from any point in the protected area to the detector nearest to that point should not exceed 5.3 metres for heat detectors and 7.5 metres for smoke detectors.

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Aico RFD manual Siting of Smoke Alarms, Positioning of Smoke Alarms, Ceiling Mounting, On a Sloping Ceiling

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