Duct Smoke Detectors

System Sensor D4120
$106.99 /each
As low as: $102.71
Same day shipping*

Same day shipping available on this item. Daily cut-off is at 1pm PST Mon-Fri.

System Sensor D4120
System Sensor 4-Wire Photoelectric Low-Flow Duct Smoke Detector
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System Sensor DST3
$7.77 /each
As low as: $7.46
Same day shipping*

Same day shipping available on this item. Daily cut-off is at 1pm PST Mon-Fri.

System Sensor DST3
System Sensor Duct-Mounted Smoke Detector Sampling Tube - 2 to 4 ft Width Duct
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Air Products and Controls MS-RA/R
$21.94 /each
As low as: $21.06
Same day shipping*

Same day shipping available on this item. Daily cut-off is at 1pm PST Mon-Fri.

Air Products and Controls MS-RA/R
Air Products and Controls Duct Smoke Detector Remote Alarm, LED Alarm Light w/Push Button Test/Reset - Single Gang
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