Normally closed fire doors need to be equipped with door closers to ensure their automatic closing function, while double or multiple fire doors also require the installation of sequencers. So, what are the similarities and differences between the door closers and sequencers of fire doors?

Firstly, the roles of the two are completely different. The main function of the sequencer is to regulate the closing sequence of the left and right doors, achieving an orderly closing action; The door closer is solely responsible for automatically closing the door leaf. These two devices work together in the application of fire doors to ensure safety.

Secondly, the installation sequence and location also have their own requirements. The sequencer and door closer cannot be installed simultaneously and must be installed in sequence. The door closer is usually installed on the door leaf and is mainly responsible for controlling the closing speed of the door leaf, while the installation position of the sequencer needs to be determined according to specific requirements to ensure that the closing sequence of the door meets expectations.

The installation position of the sequencer on double fire doors is crucial. It is usually installed in the middle of the upper frame of the two doors, so that the door that closes later can be pushed, while the door that closes first can press down on the bottom of the sequencer, ensuring precise control of the closing sequence of the doors. This installation technique is crucial for ensuring the safety performance of fire doors.