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Model OP921 is UL 268 7th edition listed incorporating advanced built-in ISOtechnologyTM - True Class-X SLC operation (use is optional)
Fire-Lite D355PL Intelligent Non-Relay Duct Smoke Detector (Replaced by D365PL)
It operates efficiently at a temperature range of -10°C to 60°C (14°F to 140°F) and a maximum relative humidity range of 95% non-condensing
15/30/75/110/135/185cd (order mounting plate and cover separately
when used with the Sync-Circuit Module accessory
System Sensor B501-WHITE 4 Inch Base System Sensor Model OP921 is UL 268System Sensor B501 WHITE 4 Inch Base, Bright White
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