Views: 0 Author: D and D Hardware Publish Time: 2021-10-21 Origin: D and D Hardware
Door coordinators are used to control the closing sequence of a pair of doors when both leaves are furnished with latching hardware and one leaf latches into the other. Typically, the doors will have a vertical rod exit device or automatic flush bolts installed on the inactive one, preassembled lock or latch or mortise exit device on the active one. If the active door closes first, the projecting latch-bolt will prevent the inactive door from closing completely. In such a case, the inactive door must close before the active one, so the doors can be closed perfectly.
The Builders Hardware Manufacturers Association (BHMA) established industry standards to distinguish the differences among various types of door coordinators. These standards are recognized by the American National Standards Institute （ANSI）. Standard A156.3 – Exit Devices establish criteria to classify coordinators.
There are two types of coordinators: soffit-mounted and gravity
Soffit-Mounted Coordinators:
Soffit-mounted coordinators consist of a rectangular shaped tube attached directly to the soffit of the head of the door frame. A bolt projects from the edge of the coordinator holding the active leaf open until it is released by the trigger mechanism on the inactive leaf. As the inactive leaf closes, it compresses a trigger and release the bolt holding the active leaf open, and allows the active door to close.
Soffit-mounted coordinators are available in primed steel and a limited number of plated finishes. Primed steel coordinators can also be painted to match the frame.
Brackets and Filler Bars
Auxiliary brackets are used with soffit-mounted coordinators to provide a secure anchoring base for parallel arm closer brackets, soffit-mounted strikes for surface vertical rod exit devices and arm brackets for overhead stops.
Filler bars are used to extend the body of soffit-mounted coordinator.
Gravity Coordinators:
Gravity coordinators consist of a cast arm and pivot assembly that is mounted to the front of the head of the door frame on the pull side of the opening. When the inactive leaf is opened the arm drops and holds the active leaf open until the inactive leaf closes, after which the arm will be pushed up and allows the active leaf to close. A roller on the end of the arm permits the coordinator to work smoothly and efficiently.
Gravity coordinators are typically used in places where aesthetics are less of a concern, due to the projection of the arm, which may also incur vandalism.
Carry Open Bars:
Carry open bars are used with both soffit and gravity coordinators. A carry open bar is attached to the inactive leaf, the active leaf can be held open by the coordinator.
The door coordinator is mainly for the service of fire rated doors, and its function is to control the closing sequence of a pair of doors. If the door cannot be closed in sequence during a fire, a door gap problem will occur, therefore the fire and smoke prevention requirements cannot be achieved. The installation of the door coordinator can decide the sequence of closing, so that the fire door can play a reliable role of fire prevention, smoke prevention and partition. D&D HARDWARE's door coordinator is made of 201/304 stainless steel, suitable for education, health-care, hospitality, residential and commercial applications. Our professional team can provide a complete hardware matching program.
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