Oil-fired furnaces are required to be tested in compliance with which standard?

Oil-fired furnaces must adhere to UL 727, which is the standard specifically focused on the safety and performance of oil-fired central furnaces. This standard outlines the testing requirements to ensure that these furnaces operate safely and effectively under normal and emergency conditions. It covers aspects such as the design, construction, and performance criteria for oil-fired heating equipment, ensuring that manufacturers provide products that meet stringent safety measures.

By specifying UL 727, it is ensured that all oil-fired furnaces are manufactured with safety features that minimize risks such as fire hazards and carbon monoxide exposure. This helps to protect both consumers and property by ensuring that the furnaces can withstand operational stresses and perform as intended in a variety of conditions. Other standards in the options do not pertain specifically to oil-fired furnaces, making UL 727 the correct choice for this specific scenario.