Minimum Distance Between Two Detectors; Arrangement With Girders - Siemens FDL241-9 Technical Manual

4.10
4.11
Building Technologies
Fire Safety

Minimum distance between two detectors

The greater the detection distance, the greater the distance between two detectors
must be. This prevents the detectors from influencing one another.
The figure below illustrates the minimum distance between two parallel infrared
rays.
Minimum distance between two parallel infrared rays

Arrangement with girders

The detector can be positioned in the ceiling panel between the girders or below
the girders.
Girders include building elements (e.g. air conditioning ducts) installed at a
distance of at maximum 15 cm below the ceiling.
Position in the ceiling panel between girders
The detector must be positioned in the ceiling panel between the girders if the
height of the girders is more than 20 % of the total room height. In this case, the
girders are considered as partition elements, and each ceiling panel must be
considered as a separate room.
Position in the ceiling panel between girders
Minimum distance between two detectors
Planning
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2012-09-07