First Alert BRK 3120B Hardwired Smoke Detector – Dual Photoelectric & Ionization with Battery Backup

Overview

The First Alert BRK 3120B is a hardwired smoke detector designed for residential and institutional spaces, including sleeping rooms in hospitals, hotels, motels, dormitories, and other multi‑family dwellings. With a built‑in battery backup, it helps maintain alertness even during power interruptions, aligning with common safety codes and standards.

Dual Sensing for Versatile Fire Detection

Equipped with both photoelectric and ionization sensing, this detector is tuned to respond to different smoke particles produced by flaming and smoldering fires. The dual sensors work in harmony to provide timely alerts while aiming to minimize nuisance alarms in busy environments.

• Dual photoelectric and ionization sensing technologies for broad coverage of smoke types.
• OptiPath 360 Technology delivers 360‑degree access to the sensor for consistent monitoring.
• UL217, NFPA 72, HUD, FHA and related codes compliance for code‑ready installation.

Alarm Behavior You Can Rely On

This model features two latching features and two silence features to help manage alerts and power conditions clearly and calmly.

• Alarm Latch clearly identifies the initiating alarm even after conditions subside.
• Low Battery Latch uses a blinking green power light to indicate which unit needs attention.
• Low Battery Silence temporarily silences chirps for up to eight hours.
• Alarm Silence allows a brief pause to assess the situation.

Power, Maintenance, and Convenience

Designed for residential and communal spaces, it runs on 120V AC with a dependable battery backup. Maintenance is straightforward thanks to an accessible battery drawer, a dust cover, and a simple test/silence control.

• 85 dB horn provides a clearly audible alert appropriate for indoor environments.
• Two AA batteries included with a 10‑year limited warranty for lasting reliability.
• Easy installation using a Quick‑Connect wiring harness to speed up retrofits or new installs.
• Two locking features help deter battery theft and keep the unit secure in shared spaces.

Real‑World Use Scenarios

Ideal for bedrooms, hallways, and common areas in hotels, motels, dormitories, and multi‑family buildings. The BRK 3120B blends into ceilings while delivering dependable notification when needed, helping building managers and occupants stay informed without disrupting daily life.