Ducts Application Note
VESDA-E
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If you have any doubts about the installation, seek support from your local Xtralis office or VESDA distributor.
2.1.2 VESDA-E VEA
Ensure duct environmental conditions do not lead to water condensation inside the tube.
Key Installation Considerations
You must consider the following when installing a VESDA-E system for duct protection:
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For air-return (negative pressure) ducts, smoke sampling must occur:
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Upstream and away from any fans.
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Upstream of humidifiers, heating coils and filters.
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Upstream of fresh air intakes.
•
For a smoke detector mounted on the duct, ensure there are no tangible vibrations when the duct
system is in full operation. If there are vibrations, insert visco-elastic foam between the smoke detector’s
mounting bracket and the external surface of the duct.
•
The inlet pipe/tube of the VESDA-E detector must be inserted at a distance of six to ten duct widths or
diameters from any flow disturbance caused by sharp bends, plenums, nozzles, branch connections
etc. Hence this system is not suitable for flexible ducts.
•
Make sure that sampling holes/points are at least 50 mm (2 inches) away from the duct walls.
