LiftMaster LM21XPBB Extended Performance Release Device

LiftMaster LM21XPBB Extended Performance Release Device – Fire and Emergency Door Control Unit with Battery Backup

The LM21XPBB Extended Performance Release Device is a fire and life safety control unit engineered to monitor and actuate commercial door systems in the event of an emergency. Designed for use with rolling doors, sliding doors, center-parting doors, and sliding-inclined doors, this unit activates door closure upon receiving signals from connected smoke detectors or other initiating alarm devices.

This device supports integration with multiple alarm accessories, including horn strobes and battery backup systems. It requires a 10k resistive sensing edge and is compliant with a wide range of commercial safety applications for institutional, industrial, and facility-based installations.

Key Features

• Emergency Door Release Functionality

  • Activates emergency door closure based on inputs from smoke detectors or other initiating systems

  • Compatible with door types including:

    • Single-slide doors

    • Rolling doors

    • Inclined sliding doors

    • Center-parting doors

• 10k Resistor Requirement

  • Requires use of a 10k ohm resistive edge for proper functionality

• Customizable Alarm Delay Times

  • Adjustable detection-to-alarm delay settings of 10, 20, 30, or 60 seconds

• Battery Backup Support

  • Compatible with 12V 4.5Ah or 5.0Ah sealed lead acid batteries

  • Supports up to:

    • 4 smoke detectors

    • 2 horn strobe devices

  • Battery standby time:

    • LM21XPBB: 72 hours

    • LM21XPBBVB: 24 hours

• Freestanding Model

  • Ideal for installations not powered by UL1481-regulated supplies with built-in battery backup

Technical Specifications