📘 First Alert manuals • Free online PDFs
First Alert logo

First Alert Manuals & User Guides

First Alert is a trusted leader in home safety products, manufacturing reliable smoke alarms, carbon monoxide detectors, fire extinguishers, and smart home security solutions.

Tip: include the full model number printed on your First Alert label for the best match.

First Alert manuals

Selected manuals from manuals+ curated for this brand.

Featured manuals are a limited selection. Search for more manuals.

FIRST ALERT Carbon Monoxide Alarm Instructions

October 30, 2023
FIRST ALERT Carbon Monoxide Alarm Instructions CARBON MONOXIDE SAFETY Carbon monoxide is an invisible, odorless and deadly gas that can be produced by any fuel- burning device. Known as “the…

First Alert 9120B Smoke Alarms User Manual

October 27, 2023
First Alert 9120B Smoke Alarms User Manual AC Powered Ionization Smoke Alarm with Silence Latching Features Model 9120 Input: 120V AC ~, 60 Hz, 0.04A AC Powered Ionization Smoke Alarm…

First Alert SM210M Micro Smoke Alarm User Manual

User Manual
User manual for the First Alert SM210M 10-year sealed battery micro smoke alarm, covering installation, testing, maintenance, safety, and troubleshooting. Learn about alarm features, placement recommendations, and warranty information.

First Alert ADN-12 Adapter Installation Guide

Installation Guide
Detailed installation instructions for the First Alert ADN-12 adapter, enabling interconnection of compatible First Alert and BRK AC-powered smoke detectors and alarms. Includes safety warnings and compatibility information.

First Alert manuals from online retailers

First Alert SM210L Smoke Alarm Instruction Manual

SM210L • July 6, 2025
Comprehensive instruction manual for the First Alert SM210L 10-Year Sealed Battery Smoke Alarm with Safety Path Light, including setup, operation, maintenance, troubleshooting, and specifications.

First Alert SMI100 Smoke Alarm User Manual

SMI100 • June 16, 2025
Comprehensive user manual for the First Alert SMI100 Battery-Operated Smoke Alarm, covering installation, operation, maintenance, troubleshooting, and specifications.