Air Aspiration Via Capillary Tubes - Siemens FDA241 Planning, Mounting

System description
3
Air aspiration variants

3.1.4 Air aspiration via capillary tubes

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Building Technologies
Fire Safety
The aspirating hole can be connected to the monitored room by a capillary tube.
This allows air aspiration in parts of the coverage area that are not in direct contact
with the pipe system.
The number, distribution and diameter of the aspirating holes in the pipes must be
individually planned for each application.
Examples:
Aspiration of air directly into control cabinets
Laying the pipe system in a false ceiling and aspirating air in the room below
Figure 2: Pipe system with capillary tube
Planning capillary tubes
Always observe the following points when planning capillary tubes:
Inner diameter of capillary tubes: 5...7 mm
All the capillary tubes in the pipe system should be of equal length
Max. length of capillary tubes: 2000 mm
If the capillary tubes are to be used to aspirate air from individual control
cabinets, pay attention to the following:
– The direction in which the air flows in the control cabinet due to ventilation
– How the air is likely to flow in the control cabinet in the event of a fire
The pipe system should always be planned using the 'FXS2056 ASD Asyst Tool
V2' software to ensure that the pipe system is as close to optimum as possible.
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2017-09-12