Edwards Signals ED-439D10AWR Polarized 10"24v Fire Bell
The Edwards Fire Alarm Bells are diode polarized, vibrating bells designed for use with fire alarm control equipment. The gongs are made of select, alloy steel to sound the loud, resonant tone required in fire alarm systems. They are epoxy powder coated red. Supplied mounting plate installs directly on surface or on any single gang box, or on any 3 1/2" (89mm) or 4" (102mm) octagon, or 4" (102mm) square electrical box.