What is a chimney primarily used for?

The primary function of a chimney is to carry gaseous products of combustion away from the appliance, such as a furnace or fireplace, to the outside atmosphere. This process is crucial for maintaining safety and efficiency in heating systems. When fuel is burned, it produces byproducts, including carbon monoxide and other harmful gases. The chimney ensures these gases are vented safely, preventing them from entering the living space and posing health risks to occupants.

Additionally, a properly designed chimney helps maintain proper draft, which is essential for efficient combustion and the effective operation of heating appliances. By directing these gases safely away, the chimney plays a critical role in ensuring both the safety and comfort of a home. Other options do not accurately represent the primary purpose of a chimney; while aesthetics may be a secondary consideration, and insulation or grounding are unrelated functions.