what is Von Duprin fire bolt


1400 degrees which is approximately 20 minutes after the fire starts.
Use a normally closed fire alarm as the input to the power supply option board (PS873-2 or PS914-2RS), this will hold the latch retracted.  During a fire alarm, the contact will open, dropping...
Fire alarm contact would tie right into the Von Duprin Chexit device not to the PS914 power supply. There is no requirement to install the fire alarm board.