SDC LR100FAK QuietDuo Retrofit Electric Latch Retraction Kit

The SDC LR100FAK QuietDuo is a motorized electric latch retraction retrofit kit designed for Falcon/Dor-O-Matic 1690 concealed vertical rod and 1790 rim exit devices on 36-inch door openings. Operating on 24 VDC with 1.5A inrush and 200 mA continuous current, the kit electrically retracts the latch and depresses the pushpad for controlled entry while preserving mechanical egress. Its internal motorized design supports access control integration without replacing the existing exit device.

SDC LR100FAK QuietDuo Electric Latch Retraction Kit for Falcon/Dor-O-Matic 1690 and 1790

The SDC LR100FAK QuietDuo electric latch retraction kit converts compatible Falcon/Dor-O-Matic mechanical exit devices into electrically controlled access hardware without requiring complete exit device replacement. Specifically designed for 1690 concealed vertical rod and 1790 rim exit devices on 36-inch openings, the field-installable kit uses a motorized mechanism to retract the latch and depress the pushpad when energized. This provides momentary unlocking for authorized entry or sustained latch retraction for push-and-pull door operation. The existing exit device continues to provide mechanical egress, making the LR100FAK suitable for commercial entrances, institutional facilities, and high-traffic access-controlled doors.

The LR100FAK operates on 24 VDC 10% and requires 1.5 amps of inrush current and 200 mA of continuous holding current. Its motor-driven retraction mechanism provides quieter operation and lower sustained current consumption than conventional solenoid-operated latch retraction systems. The standard LR100 assembly houses its motor and control components inside the exit device rail, behind the access cover. For electrical compatibility, SDC specifies the 631RF power supply for single-door installations and the 631RFUR-1 or 634RF for simultaneous dual-door operation. Third-party power supplies must provide regulated, filtered 24 VDC power with adequate inrush capacity; SDC recommends a minimum 2A rating per LR100 kit.

The SDC LR100FAK field retrofit assembly installs inside the existing Falcon/Dor-O-Matic exit device housing using the supplied mounting plate, linkage, and #10-32 flat-head mounting screws. Installation involves removing the pushbar and mechanical dogging assembly, positioning the electric latch retractor inside the device base, securing the linkage, and routing power wiring through the end cap. Existing concealed vertical rod devices require rod adjustments after installation to ensure proper latch operation. The standard configuration is intended for 36-inch openings; shortened 42-inch or 48-inch exit devices require verification of available internal clearance. The related LR100FAK-EM configuration provides an external control module for installations with restricted rail space.

The LR100FAK electric latch retraction system integrates with compatible card readers, electronic access control panels, remote release controls, and building automation systems to provide electrically controlled entry through existing exit hardware. Its motorized latch retraction also supports integration with compatible low-energy automatic door operators, allowing the latch to retract before the operator opens the door. The LR100 series is designed for use with compatible panic and fire-rated exit hardware, subject to the applicable device listings and installation requirements. Backed by an SDC five-year manufacturer warranty, the LR100FAK offers a retrofit solution for modernizing Falcon/Dor-O-Matic exit devices while retaining their existing mechanical egress functionality.