Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Issue 1 Page 5-13
February 2001
5.24 Installing the Air-Sampling Pipe Network
An air-sampling pipe network is an arrangement of pipes within the protected area through which air is
drawn back to the Detector to be sampled. Piping may be metallic or non-metallic. The pipe must be
smooth bore with internal diameters of 20, 25, 32 mm (½, ¾ or 1 inch) depending upon the design
criteria.
Figure 5.3 Mini Sample Point Kit
The sample pipe must be installed according to the system drawings developed from the criteria detailed
in the SNIFF Version 3.0 Users Manual. Any major deviations of the installation from the design drawings
must be brought to the attention of the system designer.
The sample pipe must be suspended using standard pipe hangers and the joints secured with solder or
cement according to standard plumbing practices. It is important to ensure that all joints are airtight and
the system is adequately supported to prevent any leakage, as this would affect system performance.