Von Duprin QEL99EO-4-26D Rim Exit Device
Quiet electric latch retraction (QEL) provides electronic control of an exit device for environments where limited operational noise is desired. The QEL option is Von Duprin's solution of choice for hospitals, libraries, museums and theaters where ambient noise can be disruptive. It is available on all Von Duprin 98/99, 94/95, 78/75, 33A/35A, and 22 Series exit devices. These devices always provide mechanical egress. The electrified latch retraction can also be activated by an access system or building automation system to unlatch the exit device momentarily. Often the QEL is used with a credential reader and access control system to unlock the door momentarily for authorized users. The QEL can also be configured to electronically retract the latch for an extended period of time to allow free entry. This is a convenient alternative to mechanical dogging.
If manual dogging is required, the hex dogging option is available, to order specify HD-QEL on non fire-rated devices. Special center case dogging is also available for 98/99 rim and vertical systems, specify SD-QEL. If an active pushpad is required utilize the QEL-L option. This option will retract the latch bolt and maintain an active pushpad. In some applications an audible indication of pushpad retraction is desired. The QEL-B (B-buzzer) option is a feature that can be added or retrofitted to QEL devices that will send an audible notification of initial latchbolt retraction. The QEL option is available on panic and fire rated devices. Because fire exit hardware must be self-latching, an automatic fire alarm system must be incorporated to drop power to fire rated QEL devices in case of fire.
