Gas Fitter Practice Test

A portable infrared heater that cannot be interlocked must be connected to what type of alarm?

1. CO2 monitor alarm

2. CO monitor alarm

3. O2 monitor alarm

4. CO and O2 monitor alarm

The correct answer is: CO2 monitor alarm

In the context of using a portable infrared heater that cannot be interlocked, the appropriate safety measure is to connect it to a carbon monoxide (CO) monitor alarm. This is crucial because these heaters can produce carbon monoxide as a byproduct of combustion, especially in poorly ventilated areas. A CO monitor alarm is specifically designed to detect elevated levels of carbon monoxide in the environment, ensuring that occupants are alerted to its presence and can take necessary action to evacuate or ventilate the area. While carbon dioxide (CO2) monitors may be relevant in certain applications, they are not primarily used for detecting dangerous levels associated with combustion appliances; instead, CO is the more hazardous gas. Additionally, O2 (oxygen) monitors are focused on measuring oxygen levels to ensure that there is sufficient oxygen for safe breathing and combustion, which is less critical for assessing the immediate dangers posed by a furnace or heater. Thus, the requirement for a CO monitor alarm is specifically aligned with the risks associated with operation of the infrared heater in this scenario.