Digital Fire Door Lock with Key Override PackageSuccessfully tested on Fire Doors to comply with AS1905. 1 Suits Suits apartment unit Entry Fire Doors, Fire Stair doors, egress doors Fire rated Fire Door clearances 3mm 5mm Latch Latch Deadlatch only Left and Right Handed Outside Function; Outside: Press the C button, enter the correct code, then turn the knob to unlock the door. Upon releasing the turn knob the code is automatically cancelled. The key override pin tumbler cylinder enables quick