The following conditions can result in transient carbon monoxide (CO) situations:

1.Excessive spillage or reverse venting of fuel appli- ances caused by outdoor conditions such as:

•Wind direction and/or velocity, including high, gusty winds. Heavy air in the vent pipes (cold/humid air with extended periods between cycles).

•Negative pressure differential resulting from the use of exhaust fans.

•Several appliances running at the same time competing for limited fresh air.

•Vent pipe connections vibrating loose from clothes dryers, furnaces, or water heaters.

•Obstructions in or unconventional vent pipe designs which can amplify the above situations.

2.Extended operation of unvented fuel burning devices (range, oven, fireplace).

3.Temperature inversions, which can trap exhaust close to the ground.

4.Car idling in an open or closed attached garage, or near a home.

These conditions are dangerous because they can trap exhaust in your home. Since these conditions can come and go, they are also hard to recreate during a CO investigation.

CHAPTER 7: REGULATORY INFORMATION FOR CO ALARMS

WHAT LEVELS OF CO CAUSE AN ALARM?

Underwriters Laboratories Inc. UL2034 defines 3 specific alarm points by which all residential

CO Alarms must alarm. They are measured in parts per million (ppm) of CO over time (in minutes).

UL2034 Required Alarm Points:

•If the alarm is exposed to 400 ppm of CO, IT MUST ALARM BETWEEN 4 and 15 MINUTES

•If the alarm is exposed to 150 ppm of CO, IT MUST ALARM BETWEEN 10 and 50 MINUTES.

•If the alarm is exposed to 70 ppm of CO, IT MUST ALARM BETWEEN 60 and 240 MINUTES.

•An exposure to 100 ppm of CO for 20 minutes may not affect average, healthy adults, but after 4 hours the same level may cause headaches.

•An exposure to 400 ppm of CO may cause headaches in average, healthy adults after 35 min- utes, but can cause death after 2 hours.

This CO Alarm measures exposure to CO over time. It alarms if CO levels are extremely high in a short period of time, or if CO levels reach a certain minimum over a long period of time. The CO Alarm generally sounds an alarm before the onset of symptoms in average, healthy adults.

Continued ...

CO Alarms are designed to alarm before there is an immediate life threat. Since you cannot see or smell CO, never assume it’s not present.

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BRK electronic SC6120B user manual Regulatory Information for CO Alarms, What Levels of CO Cause AN ALARM?
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SC6120B specifications

The BRK electronic SC6120B is a state-of-the-art combination smoke and carbon monoxide (CO) detector designed to provide optimal protection for homes and workplaces. This innovative device is engineered to enhance safety by detecting both smoke from fires and the presence of carbon monoxide, which is often referred to as the "silent killer" due to its odorless and colorless nature.

One of the standout features of the SC6120B is its Voice Alarm system, which emits distinct voice alerts to inform users whether smoke or CO is detected. This audio notification is crucial in emergency situations, as it allows individuals to respond quickly and appropriately. The device also includes a loud, 85-decibel alarm that further enhances alertness in the event of a danger.

The SC6120B utilizes advanced sensing technology to improve detection accuracy. It is equipped with a photoelectric smoke sensor that is known for its rapid response to smoldering fires, which produce smoke without a significant flame. This type of sensor is particularly effective for detecting slow-burning fires, such as those that begin with electrical equipment or household materials. Additionally, the SC6120B has an electrochemical sensor for CO detection, ensuring that it can identify elevated levels of carbon monoxide swiftly.

This unit is also designed for user convenience and reliability. It features a one-button test/hush function that allows users to easily test the unit's functionality or silence false alarms caused by cooking smoke or steam. The SC6120B has a low battery indicator that alerts users when it's time to replace the batteries, ensuring that the device remains operational at all times.

Another remarkable characteristic of the SC6120B is its compact and modern design, making it suitable for various environments, including bedrooms, hallways, and living rooms. It is easy to install, with a battery-operated option that eliminates the need for hardwiring, thus providing flexibility in placement.

In summary, the BRK electronic SC6120B combines innovative features, user-friendly technology, and effective safety detection into one reliable unit. Its dual function of smoke and CO detection, along with its loud alarms and voice notifications, make it an essential device for safeguarding life and property from the dangers of fire and carbon monoxide.
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