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Hold Open - a mechanism within a closer which allows a door to remain in an open position
Parallel Arm - a door closer arm that mounts on the push side of the door and the arm assembly extends almost parallel to the door. In the closed position, there is very little, or no hardware projecting beyond the frame face (in most situations). This may be beneficial in vandalism prone areas. Due to the geometry of the arm it may be about 25% less power-efficient than a regular arm application.