Sequence Selector | Zanda Door Sequence Controller

A Sequence Selector is a specialised mechanism used to manage the closing sequence of double doors. You will find these devices on rebated double doors and fire doors where a specific closing order is mandatory for compliance and safety.

What is a sequence selector?

It is a device that forces the active leaf of a double door to close and latch before the inactive leaf. This process ensures that the doors seal correctly and engage any integrated door hardware as intended.

How does a door selector work?

The selector mechanism engages when the doors are opened. When you release the doors, the mechanism holds back the inactive leaf until the active leaf has fully closed and latched. This synchronised operation maintains security and energy efficiency.

What is a door leaf selector?

A door leaf selector serves the same purpose. It controls the 'leaves' of a door set. You require a selector when your doors feature a rebated meeting stile or a sealing system that requires a precise closing order to function.

Applications and Function

• Fire door compliance: Ensures that double fire doors close in the correct sequence to maintain fire rated integrity.
• Security and efficiency: Prevents door misalignment and maintains the security barrier in commercial, hospital, and high-security environments.
• Seamless operation: Keeps both doors synchronised to avoid catching hardware or damaging door frames during operation.