System Sensor DNR SF 15/01 They all feature 3/4 inch

They all feature 3/4 inch tapped conduit entries

The Gamewell-FCI Velocity® Series

fieldselectable settings

The NOTIFIER® FST-951 Series intelligent thermal detectors are designed for both performance and aesthetics

diameter base product

System Sensor DNR SF 15/01 They all feature 3/4 inchThe Honeywell DNR intelligent non relay photoelectric duct smoke detector and DNRW watertight non relay photoelectric duct smoke detector feature a pivoting housing that fits both square and rectangular footprints capable of mounting to a round or rectangular duct. The DNRW duct smoke detector, with its NEMA 4 rating, is listed as a watertight, UV resistant enclosure providing protection against falling dirt, rain, and windblown dust, splashing and