https://www.dormakaba.com/cn-en/offering/products/door-hardware/door-closers/sr-390-sr-392--do_2874
dormakaba - SR 390 / SR 392 Door Coordinators
The SR 390 is a thoroughly proven, purely mechanical door coordinator for twinleaf fire and smoke check doors. The SR 392 is a co-ordinator for double-wing...
sr 390dormakaba392doorcoordinators