What precaution should be taken when operating oil-fired appliances?

The correct approach when operating oil-fired appliances is to ensure that a carbon monoxide detector is installed in the vicinity. This precaution is vital because oil-fired appliances, like furnaces and boilers, can produce carbon monoxide, a colorless and odorless gas that can be deadly. A carbon monoxide detector provides an essential safety measure, alerting occupants to the presence of this hazardous gas, thereby allowing them to take prompt action to protect themselves.

Regular inspections and maintenance of oil-fired appliances, which includes checking for proper ventilation and ensuring safe operation, are also important; however, these measures do not directly address the immediate danger posed by potential carbon monoxide exposure. Additionally, keeping flammable materials nearby is unsafe and can lead to fire hazards, while limiting operation to daylight hours does not effectively address the risk of carbon monoxide, which can occur at any time. Hence, the installation of a carbon monoxide detector is the most critical and proactive safety measure in this context.