Natural Gas Alarm AJ-989
10-Year Battery Life
85 dB Loud Alarm
10% LEL Sensitivity
UL 1484 Standard
NYC Law 157 Compliant
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Natural Gas Alarm AJ-989 | 10-Year Battery UL 1484 Methane Detector for NYC Local Law 157
The AJ-989 Natural Gas Alarm is a next-generation methane (CH₄) leak detector engineered for residential and commercial safety. Featuring a sealed 10-year lithium battery, MEMS thermoelectric semiconductor sensor, and 85 dB audible alarm at 10% LEL, the AJ-989 delivers maintenance-free, round-the-clock protection against natural gas leaks — with zero battery replacements for a full decade.
Built to the UL 1484:2025 standard for fuel gas alarms, the AJ-989 is the ideal solution for property owners preparing for New York City Local Law 157 compliance ahead of the January 1, 2027 deadline.
Why Choose the AJ-989 Natural Gas Alarm?
🔋 10-Year Sealed Battery
Powered by 3 CR17505 3V 3000mAh lithium batteries delivering a full 10-year service life — no replacements, no downtime, no maintenance costs.
🎯 Precision MEMS Sensor
Advanced MEMS thermoelectric semiconductor sensor detects methane at 10% LEL — triggering early warnings far below dangerous concentrations.
🔊 85 dB Loud Alarm
High-decibel buzzer emits >85 dB at 3 meters with flashing LED indicator, ensuring the alarm is heard and seen throughout the premises.
🌡️ Wide Environmental Tolerance
Operates reliably in 32°F–122°F (0°C–60°C) and 5%–95% non-condensing humidity — performing in kitchens, basements, and utility rooms.
🏠 25 m² Coverage
Each unit protects approximately 25 square meters — ideal for apartments, homes, offices, and multi-unit dwellings.
🛡️ UL 1484:2025 Compliant
Meets the latest ANSI/UL 1484:2025 6th Edition standard for residential fuel gas alarms — the benchmark for natural gas detector safety and performance.
🗽 NYC Local Law 157 Compliance — Act Before January 1, 2027
New York City’s Local Law 157, as amended by Local Law 102 of 2025, requires all Class A multiple dwellings, Class B multiple dwellings, and private dwellings to install approved, operational natural gas detecting devices by January 1, 2027.
Key Compliance Requirements:
- ✅ One or more approved natural gas alarms per dwelling unit
- ✅ Devices must be listed in accordance with UL 1484 or UL 2075
- ✅ Installed within 12 inches (0.3m) from the ceiling (natural gas rises)
- ✅ Positioned 3–10 feet from gas appliances
- ✅ At least 5 feet from cooking appliances
The AJ-989 is purpose-built for NYC Local Law 157 compliance: UL 1484-standard performance, 10-year sealed battery (perfect for older buildings without wiring access), and simple ceiling-mount installation — no electrician required.
Note: If the DOB determines fewer than 4 manufacturers of battery-powered natural gas alarms exist by July 1, 2026, the deadline may extend to January 1, 2029. Property owners are advised to comply ahead of the 2027 deadline to avoid enforcement risk.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | AJ-989 Natural Gas Alarm |
| Target Gas | Natural Gas / CH₄ / Methane |
| Detection Principle | MEMS Thermoelectric Semiconductor Sensor |
| Sensor Life | 10 Years |
| Working Voltage | DC 3V (Built-in lithium battery CR17505 × 3) |
| Battery Life | 10 Years (sealed, no replacement) |
| Standby Current | < 3 μA |
| Alarm Current | < 60 mA |
| Low Voltage Threshold | 2.3V |
| Alarm Threshold | 10% LEL |
| Alarm Sound | > 85 dB at 3 meters |
| Alarm Mode | LED Indicator + Buzzer |
| Detection Range | ≈ 25 square meters |
| Operating Temperature | 32°F – 122°F (0°C – 60°C) |
| Operating Humidity | 5% – 95% non-condensing |
| Product Size | 108 × 88 × 40 mm (4.25″ × 3.46″ × 1.57″) |
| Compliance Standard | UL 1484:2025 (ANSI/UL 1484 6th Edition) |
| Application | Residential, Apartments, Multi-Dwellings, Commercial Kitchens |
What is UL 1484:2025?
UL 1484 is the American National Standard for Fuel Gas Alarms, published by Underwriters Laboratories. The 6th Edition (April 28, 2025) sets rigorous safety and performance criteria for residential natural gas and propane detectors:
- Detection threshold: Alarms must trigger at ≤ 10% LEL (Lower Explosive Limit) — providing early warning before gas reaches dangerous levels
- Fast response time: Rapid detection and alarm activation when gas concentration meets the standard’s criteria
- False alarm resistance: Devices must resist nuisance alarms from cooking fumes, household chemicals, and aerosols
- Environmental reliability: Tested for performance under varying temperature, humidity, and electrical disturbances
- Corrosion resistance: New 21-day corrosion test (optional alternative to 10-day cycle) ensures long-term durability
- Power supply & backup: Must operate reliably on primary and backup power sources
- Audibility: Alarm sound must be loud enough to be heard throughout the home
The AJ-989 is designed and tested to UL 1484:2025 compliance, ensuring it meets the highest safety benchmarks for natural gas detection in residential and RV applications.
Recommended Installation
- 📐 Mount within 12 inches (0.3m) from the ceiling — natural gas is lighter than air and rises
- 📏 Place at least 5 feet (1.5m) from cooking appliances or cooktop hoods to avoid false alarms
- 🔥 Position 3–10 feet (0.9–3m) from gas furnaces, water heaters, and gas lines
- 🚫 Avoid dead air spaces, corners, or behind furniture where airflow is restricted
- 🏠 For multi-floor homes, install at least one unit per floor with gas appliances
Ideal For
🌍 Wholesale & Bulk Orders Welcome
The AJ-989 Natural Gas Alarm is available for global bulk shipping. We support:
- ✅ OEM & ODM customization (private label, branding, packaging)
- ✅ Flexible MOQ for distributors and wholesalers
- ✅ Worldwide shipping to North America, Europe, Asia, and beyond
- ✅ Competitive factory-direct pricing
- ✅ Technical documentation & certification support for local compliance
- ✅ Sales agent partnerships welcome worldwide
With the January 1, 2027 NYC Local Law 157 deadline approaching, now is the time to secure your inventory of compliant natural gas alarms.
Ready to Order the AJ-989 Natural Gas Alarm?
Get a wholesale quote for UL 1484 compliant, 10-year battery natural gas detectors — perfect for NYC Local Law 157 compliance.
Sales Agent Inquiries Welcome · Global Shipping Available
Frequently Asked Questions
Is the AJ-989 compliant with UL 1484?
Yes, the AJ-989 is designed and tested to meet the ANSI/UL 1484:2025 6th Edition standard for fuel gas alarms, the benchmark for residential natural gas detector safety and performance.
Does the AJ-989 meet NYC Local Law 157 requirements?
The AJ-989 is purpose-engineered for NYC Local Law 157 compliance: it meets UL 1484 standards, features a 10-year sealed battery (ideal for existing buildings), and is designed for ceiling-mount installation within 12 inches of the ceiling. Property owners must install approved natural gas alarms by January 1, 2027.
How long does the battery last?
The AJ-989 features 3 CR17505 3V 3000mAh lithium batteries delivering a full 10-year service life with no replacements needed.
What area does one unit cover?
Each AJ-989 protects approximately 25 square meters. Larger spaces require multiple units strategically placed near gas appliances.
Do you offer bulk discounts?
Yes! We welcome wholesale orders, OEM/ODM customization, and sales agent partnerships with global shipping. Contact us for volume pricing.
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