Silent Knight SD505-T5 — 5 ft intake air sampling tube for the SD505-DUCT and SD505-DUCTR addressable duct smoke detector housings.
The SD505 duct housing samples duct air through two tubes: a 7.5 in. exhaust tube supplied with the housing, and an intake sampling tube ordered separately, which must extend the full width of the duct with its drilled sampling holes facing into the airflow. Silent Knight states that tubes may be ordered to a desired length or ordered in one of three standard lengths and cut per requirements, so the T5 may be field-trimmed. Duct penetrations are 1-3/8 in. diameter using the supplied template.
- Intake sampling tube for 2.5 ft to 5.0 ft duct width
- Nominal 5 ft length
- Fits SD505-DUCT and SD505-DUCTR housings
- Housings rated for duct air velocity 300 to 4000 ft/min
- Ordered separately; not supplied with the housing
Order by duct width, not by habit: SD505-T2 covers 6 in. to 2.5 ft and SD505-T10 covers 5.0 ft to 10.0 ft. A tube shorter than the duct will not sample the full cross-section. Intake tube only — the exhaust tube ships with the housing.
