The Kidde SD-T42 is a 42-inch rigid air sampling tube for SuperDuct duct smoke detectors. It slides directly into the detector housing and samples air across the full width of a 42-inch duct, feeding it to the detector's sensing chamber for reliable smoke detection in HVAC systems.
Built for fast duct detector installs
The tube installs from the front or back side of the SuperDuct housing and rotates in 45-degree increments to align sampling holes with duct airflow. Compatible with both four-wire (SD-4W series) and two-wire (SD-2W series) SuperDuct detectors. If you're replacing an older duct detector, the standard tube dimensions make it a straightforward swap.
Key features
- 42-inch coverage: spans full duct width for complete air sampling
- Front or back mounting: flexible installation depending on duct access
- 45-degree rotation increments: align sampling holes to airflow direction without cutting or modifying
- Drop-in compatible: works with Kidde SuperDuct SD-2W and SD-4W series detectors
Brand:
Kidde Commercial
Form factor:
42-inch rigid air sampling tube
Compatibility:
Kidde SuperDuct SD-2W (two-wire) and SD-4W (four-wire) series duct smoke detectors
Mounting:
Front-side or back-side insertion into SuperDuct housing; rotates in 45-degree increments
Weight:
3.5 lb (1.6 kg)
What duct detectors is the SD-T42 compatible with?
The SD-T42 works with Kidde SuperDuct four-wire (SD-4W series) and two-wire (SD-2W series) duct smoke detectors. It inserts directly into the SuperDuct housing.
What length sampling tube do I need?
Select the tube that spans the full width of the duct. Kidde offers sampling tubes from 18 to 48 inches in 6-inch increments. The SD-T42 covers 42-inch wide ducts.
Can the sampling tube be rotated for alignment?
Yes. The tube rotates in 45-degree increments inside the SuperDuct housing, letting you align the sampling holes with duct airflow direction without cutting or modification.
Does this tube work with Kidde Intelligent Duct Detectors?
The SD-T42 is confirmed as an accessory for SuperDuct conventional duct detectors (SD-2W and SD-4W series). For Intelligent Duct Smoke Detectors, check the specific model's accessory compatibility list or contact SS&Si support.
Spec Sheet
