Boiler draft is the difference in _____ between two points:

Boiler draft refers to the pressure difference that is created between different points within the boiler or its flue gas path. This pressure difference is essential for effective combustion, as it facilitates the movement of combustion gases through the system and helps control the intake of air for burning fuel.

In the context of boiler operations, maintaining optimal draft is crucial because it impacts efficiency and safety. If the draft is too low, combustion might be incomplete, leading to excess emissions and potential fouling of the system. Conversely, if the draft is too high, it can lead to excessive losses of heat with flue gases and even create unsafe operating conditions.

Understanding boiler draft as a measure of pressure difference helps operators monitor and manage their systems for optimal performance and safety.