Planning
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Building Technologies A6V10209291_f_en_--
Fire Safety & Security Products 05.02.2010
4 Planning
4.1 Fire detection
4.1.1 Ambient features
In selecting the optimum fire alarm parameter set, the following factors must be
taken into account:
Risk of injury to persons
Concentration of valuable items
Room geometry
Deceptive phenomena
Risk of fire
Critical fire size
Risk of injury to persons
People are extremely endangered in localities such as concert halls, nursing
homes or hospitals. The risk of injury to persons is therefore very high in such
places. In canteen kitchens the situation is different. Few people work in such
facilities and are able to save themselves in the event of timely alarms. The risk of
injury to persons is thus rather low in this case.
Concentration of valuable items
Irreplaceable cultural assets are often on display in museums. Computer centers
house servers with large data volumes. The concentration of valuable items is
rather high. In a normal hotel room the concentration of valuable items must be
classified as low.
Room geometry
High ceilings, complex room shapes or well ventilated rooms have a complex room
geometry. This aggravates early fire detection, as it is difficult for the fire
phenomenon to reach the fire detector. An office room with normal ceiling height
has a simple room geometry.
Deceptive phenomena
Deceptive phenomena can deceive a fire detector and bring about a false alarm.
Depending on the fire detector in question, the deceptive phenomena may be e.g.
vapor, cigarette smoke, dust, dry ice in discotheques, exhaust fumes, aerosols
occurring during welding or heat sources such as radiant heaters or hot engines.
In a small hotel room with a rather low ceiling where vapor from the bathroom may
penetrate the room, or in operating facilities where a lot of dust is generated, many
deceptive phenomena must be taken into consideration. In a clean room where
electronic modules are fabricated the risk of deceptive phenomena is rather low.
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