The Von Duprin 967242 Emergency Secure Lockdown (ESL) Kit adds emergency lockdown functionality to compatible 3-foot 35A QEL exit devices. During an emergency lockdown, the kit interrupts power to the QEL motor and extends the latchbolt to secure the pull side of the door while maintaining free egress from the exit side.

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Manufacturer: Von Duprin
Part Number: 967242
Product Name: ESL Kit for 35A QEL 36" 
Product Type: Emergency Secure Lockdown Retrofit Kit
Device Length: 36-inch
Primary Function: Emergency secure lockdown of compatible QEL exit devices
Application:  Retrofit compatible 3-foot 35A QEL exit devices 
OEM Part: Yes