Underwriters Laboratories, Inc. Standard UL2034 requires residential CO Alarms to sound when exposed to levels of CO and exposure times as described below. They are measured in parts per million (ppm) of CO over time (in minutes).
UL2034 Required Alarm Points:
- At 70ppm, the unit must alarm within 60-240 minutes.
- At 150ppm, the unit must alarm within 10-50 minutes.
- At 400ppm, the unit must alarm within 4 to 15 minutes.
This unit is designed not to alarm when exposed to a constant level of 30 ppm for 30 days.
Caution: The alarm only indicates the presence of carbon monoxide gas at the sensor. Carbon monoxide gas may be present in other areas.
Warning: This carbon monoxide alarm is designed to detect carbon monoxide from any source of combustion. It is NOT designed to detect any other gas.
Important: If your Halo alarms for carbon monoxide, or you suspect you are experiencing symptoms of carbon monoxide poisoning, you should immediately leave your home and call 9-1-1.
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