EDWARDS-SIGNALING Air Sampling Tube 3 ft 1/2 in SD-T42

Air Sampling Tube for Fire Detection

The Edwards Signaling SD-T42 is a 3 ft 1/2 in air sampling tube designed for use with the SD-4WJ fire detector. It channels air from the protected space to the detector for early smoke analysis. This component suits commercial or industrial fire safety installations that require aspirating detection. It arrives new and weighs 1.18 units.

Passive Conduit With No Active Electronics

The tube is a passive conduit; it carries no voltage, draws no standby current and produces no alarm output or candela flash. Its only stated dimensions are a length of 3 ft and a width of 1/2 in. It adds no electrical load to the circuit and has no humidity, coverage or duct-opening ratings of its own. Performance depends entirely on the paired detector.

Verify Detector Compatibility Before Ordering

Confirm that the fire detector you intend to use is the SD-4WJ model referenced by the manufacturer. The tube has no independent standards listing, auxiliary contacts or voltage rating, so it cannot function as a standalone device. Ensure your system design accommodates a 3 ft sampling length and 1/2 in tube width. No other detector compatibility is documented.