Natural and mechanical are categories of what aspect in heating systems?

Natural and mechanical refer to categories of draft in heating systems. Draft is critical for the proper operation of combustion appliances, as it ensures that combustion gases are safely vented outside while drawing in fresh air for the combustion process.

Natural draft relies on the difference in air density, caused by temperature differences between the inside of the flue or chimney and the outside air, to create a flow of air that moves gases upward. This type of draft is often found in traditional chimney systems where hot gases rise and create a negative pressure that draws additional air into the combustion area.

Mechanical draft, on the other hand, utilizes fans or blowers to actively control the flow of air through the combustion process. This system can provide greater control over the combustion environment and can be critical in systems that require more precise air flow to maintain efficiency or manage emissions.

Understanding the distinction between natural and mechanical draft is vital for ensuring that heating systems operate safely and efficiently, allowing technicians to troubleshoot and optimize performance effectively.