How is draft typically measured in a boiler system?

Draft in a boiler system is typically measured in inches of water. This unit of measurement is appropriate for gauging the pressure difference in gas streams, commonly encountered in HVAC and boiler applications.

Inches of water measure very small pressure differences and are particularly relevant in cases where airflow dynamics are essential, such as in combustion processes within boilers. The use of inches of water allows operators and engineers to assess the effectiveness of draft in ensuring proper airflow and combustion efficiency, which are crucial for optimal boiler operation.

While inches of mercury and pascals are also units of pressure, they are more often used in contexts requiring higher pressure measurements. Millimeters of water can be used, but inches of water are more standard in the industry for this specific application, making it the most suitable choice.