Combustion Appliances Safety Test (CAST) Practice Test

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What does IWC stand for in combustion terminology?

Instability Water Column

Inches of Water Column

In combustion terminology, IWC stands for "Inches of Water Column." This measurement is crucial for assessing the pressure in combustion appliances, particularly in natural gas systems. It refers to the height of a column of water that is equivalent to the pressure being measured.

Using inches of water column is essential for determining the appropriate gas pressure for safe and efficient operation of various appliances, including furnaces, boilers, and water heaters. Proper pressure settings help ensure optimal combustion efficiency and reduce the risk of hazardous conditions, such as backdrafting or incomplete combustion. This term is widely used by technicians and professionals in the field to measure gas supply pressure and ventilation requirements effectively.

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Intensity of Water Column

Induced Water Column

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