Final answer:
Indirect vaporizers must have an automatic safety feature to prevent carbon monoxide production. Incomplete combustion in heaters can lead to dangerous levels of this gas, causing several deaths annually.
Step-by-step explanation:
Indirect vaporizers shall be provided with an automatic means to prevent the production of dangerous gases such as carbon monoxide (CO). The reaction of incomplete combustion within gas heaters, which can lead to carbon monoxide production, is responsible for numerous fatalities every year. Unventilated or improperly adjusted gas heaters, as well as kerosene heaters, can produce dangerous levels of carbon monoxide, leading to potentially lethal outcomes. Carbon monoxide is a colorless, odorless, and tasteless gas which can cause serious health issues or death when inhaled in sufficient quantities. Therefore, safety devices are essential in preventing any unforeseen incidents related to these types of heaters.