LiftMaster LM21XP Fire Door Control Device

The LiftMaster LM21XP Fire Door Control Device is a UL-listed and highly reliable release panel designed to interface with motorized fire doors, ensuring safe and controlled closure in the event of a fire alarm, power outage, or other emergency scenarios. This intelligent control unit supports fire-rated door systems in commercial, industrial, and institutional environments.

With advanced microprocessor-based technology, the LM21XP provides superior system diagnostics, flexible time-delay programming, and fail-safe operation. This fire door release panel integrates with most conventional fire alarm systems and is compatible with 24V AC/DC power sources, making it a versatile and adaptable solution for a wide range of applications.

Key Features:

• Model: LM21XP

• Function: Fire door release and control panel

• Compatibility: Works with LiftMaster and other motorized fire doors

• Certifications: UL 864 and UL 10B Listed

• Power Input: 24V AC or DC

• Fire Alarm Integration: Accepts dry contact or open circuit alarm signals

• Time Delay Settings: Fully programmable release delays (up to 60 seconds)

• Testing Function: Built-in test/reset button for easy diagnostics

• Monitoring: LED indicators for power, alarm status, and door position

• Fail-Safe Operation: Automatically triggers door closure during power loss or alarm signal

• Relay Outputs: Connects to audible/visual alerts or motor operators

• Housing: Durable enclosure for wall mounting in indoor environments

Benefits:

• Ensures life safety and fire code compliance

• Allows seamless connection to fire alarm systems

• Minimizes false activations with adjustable delay

• Quick installation and simple configuration

• Reliable operation during emergency power failures

Ideal Applications:

• Warehouses

• Hospitals and healthcare facilities

• Schools and universities

• Manufacturing plants

• Parking structures and high-traffic commercial buildings

The LiftMaster LM21XP is a trusted solution for ensuring that rolling fire doors and smoke barriers deploy properly when needed—helping facilities meet safety codes while protecting occupants and property.