A duct detector usually installed in heating, ventilating, and air conditioning (HVAC) ducts to detect fires in HVAC system. Duct smoke detectors detect smoke and combustion products in the air that flows through HVAC ducts. These devices prevent smoke recirculation in areas caused by air handling systems.

Duct detectors supports a wide range of voltage inputs (i.e. 24VDC, 120VAC, etc). An intake sampling tube that protrudes into the duct is used to sample air on a duct detector. Remote test used to test duct smoke detectors from a convenient location. Piezo annunciator provides an audible alarm signal without the use of a system control panel.

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