System Sensor DNR SF 15/01 The sounder base is capable

The sounder base is capable of producing either the distinctive three-pulse temporal pattern (ANSI Temporal 3) fire alarm signal now required by NFPA 72 for commercial and residential applications or a continuous tone by simply removing the included jumper from the device

They all feature 3/4 inch tapped conduit entries

fieldselectable settings

These horns may be mounted to any solid surface using two bolts (by others)

System Sensor DNR SF 15/01 The sounder base is capableThe 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