The Von Duprin® 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.
The QM option can be ordered pre-installed from the factory. Retrofit kits are also available for both the trim and device, which provides a cost effective way to upgrade existing devices. No modifications to the existing door or frame prep are required. Compatible with other mechanical and electronic options including quiet electric latch retraction (QEL), accessible design (AX), request to exit switch (RX), cylinder (CD) and hex (HD) dogging to address a variety of applications. Von Duprin devices and trim with the QM maintain ANSI BHMA A156.3 Grade 1 (2014), UL305 and UL10C certifications.
For optimal quiet performance of your total opening, use the Von Duprin QM option along with a properly adjusted door closer and door silencers. The acoustical performance of an opening is based on a variety of factors including the door and frame material, closer performance, and door accessories. Allegion offers a wide portfolio of solutions to address your specific needs.