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Hold Open - A door closer arm with the capability of holding the door in the open position until manually closed. Hold Open arm door closers are not permitted to be used on fire door assemblies.
Parallel Arm - Arm is mounted 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 is approximately 25% less power-efficient than a regular arm application.
UO - Universal Arm standard - with brackets to install closer in standard, top jamb or parallel applications
UH - Universal Hold Open Arm - with brackets to install closer in standard, top jamb or parallel applications
PS - Heavy Duty Parallel Arm with Positive Stop
CPS - Heavy Duty Parallel Arm with Compression Stop
P10 - Heavy Duty Parallel Arm
CPSH - Heavy Duty Hold Open Parallel Arm with Compression Stop
PSH - Heavy Duty Parallel Hold Open Arm with positive Stop