Chimney Safety Institute of America (CSIA) Certification Practice Test

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What is draft measured in?

Feet of water column
Inches in water column
Pounds per square inch
Millimeters of mercury

The correct answer is: Inches in water column

Draft, which pertains to the pressure differential required to move flue gases through a chimney or venting system, is specifically measured in inches of water column. This measurement reflects the pressure difference created by the heat of the combustion gases, enabling them to rise and exit through the chimney. It is a standard unit used to ensure that appliances operate efficiently and safely, maintaining proper ventilation and preventing backdrafts. The measurement in inches of water column is especially relevant because it provides a sensitive gauge of the pressure changes necessary in chimney systems, even with relatively small pressure variations. Understanding this scale is critical for chimney professionals to evaluate the performance of venting systems and make necessary adjustments to achieve optimal draft conditions.