ANSI / UL 2034Active National Consensus Standard
Standard for Single and Multiple Station Carbon Monoxide Alarms
Issuing Organization: UL Standards & Engagement / ANSI
Edition: 5th Edition with 2022 Revisions
Verified: 2026-09-01
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Regulatory Scope & Application
Covers electrically operated single and multiple station carbon monoxide alarms intended for protection in ordinary indoor locations of residential units and ambulatory healthcare facilities.
Key Engineering & Life Safety Requirements:
- Alarms must not activate below 30 ppm for 30 continuous days to prevent nuisance false positives.
- Mandatory alarm response: 70 ppm within 60–240 min, 150 ppm within 10–50 min, 400 ppm within 4–15 min.
- Requires audible alarm signal minimum of 85 dBA at 10 feet with standardized temporal-4 cadence.
Full consensus documentation available via standard catalogView Official Standard Specification
SERVICEFIND ACCREDITED TRADES DIRECTORY
When to Contact a Qualified Professional: Code Compliance & Safety Audit
While understanding building standards and hazard mechanics helps protect your family, diagnostic testing and repair of combustion appliances, gas lines, electrical distribution, and structural foundations must only be performed by licensed and bonded contractors.
Critical Indicators Requiring Immediate Certified Trade Intervention:
- Jurisdictional verification of adopted NFPA/UL standards.
- Decibel acoustic audit for hardwired interconnected alarms.
- Certification of sensor expiration dates and branch circuit bonding.
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Emergency Safety Rule: If you suspect active gas leaking or structural collapse, evacuate the structure immediately and dial 911. Never wait for an estimate.