SDC LR100MDK QuietDuo LR100 Series Marks Field Install Retrofit Electric Latch Retraction Kit, M9900, 36" Opening

Optimize door access and security with the Security Door Controls QuietDuo LR100 Series electric latch retraction kit (LR100MDK). Built as a field retrofit electrified deadlatch solution, this kit converts mechanical Marks exit devices into remotely controlled, doggable exit hardware—delivering smoother egress and centralized access control without replacing the entire device. The LR100MDK runs on 24V DC and is engineered for 36" openings, so it integrates easily with standard access control power supplies and door sizes. Its low-noise QuietDuo motor retracts the latch and depresses the pushpad to enable momentary or sustained push/pull operation, improving user convenience while maintaining secure egress. Designed for installers and facility managers, the kit reduces downtime, supports compliance with building circulation needs, and complements security, surveillance, and monitoring systems by enabling remote control and status-based door management. Ideal for schools, hospitals, offices, and retail environments, the LR100MDK offers a cost-effective way to upgrade entry points. Enhance your door control strategy and upgrade perimeter security—order the Security Door Controls LR100MDK retrofit kit today.

• Enables electric access control and dogging of existing mechanical exit devices for improved entry flow and security
• QuietDuo motor provides low-noise latch retraction for high-traffic commercial and institutional doors
• Field retrofit design installs quickly on Marks exit devices, saving time and avoiding full hardware replacement
• Supports 24V DC operation and fits 36" openings to integrate with common access control power supplies
• Allows momentary or sustained push/pull operation for flexible egress, reducing wear and simplifying monitoring