Improved Audibility
The effectiveness of Category LD2 and LD3 systems can
be significantly enhanced if an additional Smoke Alarm
(interconnected) is installed in the master bedroom. This will
help ensure that a responsible person will quickly be alerted
to a fire and can arrange for an orderly evacuation of children
and other vulnerable occupants.
2.3 Grade D, E & F Systems
The mains powered Smoke and Heat Alarms with battery
back-up covered by these instructions are suitable for Grade
D, E & F Systems.
A Grade D system is needed for:
- new or materially altered dwellings, up to three-storeys,
with no floor over 200m
2
- existing dwellings with poor structural fire precautions, up
to three storeys, with no floor over 200m
2
- Houses in Multiple Occupation (HMOs) of one or
two-storeys, with no floor over 200m
2
- Individual dwellings units of two or more rooms in HMOs
Check that a Grade D system is adequate for the dwelling
into which the system is being installed.
3. POSITIONING ALARMS
The locations must comply with applicable building
regulations.
Hot smoke rises and spreads out, so a central ceiling
position is the preferred location. The air is “dead” and
must be mounted away from corners. Place the unit:
- At least 0.3m away from walls. See Figure 1.
- At least 0.3m from any light fitting or decorative object
which might obstruct smoke / heat entering the Alarm.
(Smoke Alarms should be located directly on the ceiling or,
if not possible, up to 575mm below it. Heat Alarms should
be located directly on the ceiling or, if not possible, up to
125mm below it).
Sloping Ceiling
With a sloping or peaked ceiling install a Smoke Alarm
within 600mm of the peak or a Heat Alarm within
150mm of the peak (measured vertically). If this height
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