The QM option controls motion to reduce operational noise. It is available for the 996 trim, as well as 98/99 and 33A/35A rim and surface vertical rod devices.
The QM trim solution provides a damper-controlled lever return. Likewise, the QM rim device option provides damper-controlled re-latching. 

Features and benefits:

• Controlled motion to reduce operational noise
• 996 damper-controlled lever return
• 98/99 and 33/35A damper controlled re-latching
• Available pre-installed from factory or as a retrofit kit
• Compatible with QEL, AX, RX, CD and HD