Automist Smartscan Hydra
®
DIOM Manual - version 3.01.0
Plumis Ltd Copyright © 2020. All Rights Reserved.
Page 26 of 116
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®
The sprayhead must therefore have approximate line of sight of any possible fire hazards within this range,
and be positioned at least:
•
1.5m away from any hob
•
1m away from any oven (if in direct line of sight)
•
3m away from any log burners or small fireplaces
Visibility extends radially from each sprayhead and ends wherever there is an obstruction. If an obstruction
is fixed and equal or more than 0.9m high (standard worktop height), it must be regarded as blocking the
line of sight from any sprayhead positioned within 3m, and reflected in the layout drawing. For example,
bookshelves, wardrobes, large fridges, or vertical radiator covers. Obstructions higher than 0.9m and wider
than 0.3m must be regarded as blocking the line of sight at any distance. This does not relate to a
householder deciding to disable the suppression system; full obstruction of the sprayhead or the creation
of de facto room partitions with bookcases are akin to wilfully removing fire doors, decorating over
sprinkler heads, or removing detectors and are beyond the scope of this recommendation.
Obstruction
An obstruction can impact the ability of an active fire suppression system to suppress a fire and its
objective to cap the fires growth (limit the production of heat and toxic gas). The obstruction risk depends
on the system so the traditional obstruction sources for traditional systems do not apply to Automist, other
risks instead must be considered:
Traditional ceiling mounted
suppression
Automist Smartscan
Sprayhead
Ceiling mounted
Wall mounted
Obstruction
Plane
Horizontal
Vertical
Examples of
obstruction to
either detection
or suppression
Shielded fires (e.g. under worktops and
cupboards, fire under a table or sofa),
painted sprinkler head, light fixtures,
ceiling fans, beams girders under joints,
high wardrobes under the nozzle.
Large wall mounted furniture (e.g. a
fridge, a bookcase, wall cupboard or
cabinet, wardrobe) too close
(horizontally) to the sprayhead.
Mitigation
method
Locating sprayheads with sufficient
clearance from beams, racking, girders,
etc.
Locating sprayheads in “Preferred
Positions” (see page 35) and automatic
design software checks.
All fire safety products require education of, and co-operation with, the homeowner to ensure they will
work. Be it, preventing compartmentation from being compromised by tradesmen, fire doors from being
propped open, smoke alarm batteries from being removed, or stopping people from placing things in the
path of fire curtains.
The Automist sprayhead
The Automist sprayhead is mounted at a height of 1200 - 1450mm from floor level in a kitchen and 1400 -
1450mm from the finish floor level in all other rooms. The lower height in the kitchen is for better targeting
of the significant fire risks; white goods and the hob/cooker in a room assuming a standard worktop height
of 900mm high.
