What is boiler draught and what are the two types?

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Multiple Choice

What is boiler draught and what are the two types?

Draught is the pressure difference that moves air into the boiler’s furnace to support combustion. Without proper draught, fuel won’t burn efficiently or safely. There are two common ways to create this air flow: forced draft and induced draft. Forced draft uses a fan to push air into the furnace, producing a positive pressure that drives the combustion air in. Induced draft uses a fan (or exhaust system) to pull flue gases out of the furnace, creating a slight negative pressure inside the furnace that draws air in through the openings and helps pull the combustion gases up the stack. This setup helps prevent backflow and improves exhaust flow. The other options describe things like how much fuel is fed, how fast steam is produced, or room humidity, none of which define draught.

Draught is the pressure difference that moves air into the boiler’s furnace to support combustion. Without proper draught, fuel won’t burn efficiently or safely.

There are two common ways to create this air flow: forced draft and induced draft. Forced draft uses a fan to push air into the furnace, producing a positive pressure that drives the combustion air in. Induced draft uses a fan (or exhaust system) to pull flue gases out of the furnace, creating a slight negative pressure inside the furnace that draws air in through the openings and helps pull the combustion gases up the stack. This setup helps prevent backflow and improves exhaust flow.

The other options describe things like how much fuel is fed, how fast steam is produced, or room humidity, none of which define draught.

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