Hochiki SDP-2 and SDP-3 duct detector housings with sampling pipe, bracket and cover, so a standard detector can sample the air inside AHU and ventilation ducts.
Hochiki duct detector housing
Smoke spreads fast through air ducts. A duct detector housing holds a detector outside the duct and draws duct air past it through a sampling pipe, so the AHU can be shut down on alarm. Hochiki SDP-2 and SDP-3 housings take Hochiki detectors.
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