Which type of fan creates a positive pressure inside the boiler furnace?

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Multiple Choice

Which type of fan creates a positive pressure inside the boiler furnace?

Explanation:
A positive pressure in the boiler furnace is created by pushing air into the combustion chamber. The force draft fan does exactly that: it pushes ambient air through the air inlet into the furnace, raising the pressure inside relative to the surrounding flue path. This positive pressure drives air into the furnace, supporting steady, controlled combustion. In contrast, an induced draft fan sits on the flue gas outlet and pulls gases out, creating negative pressure inside the furnace; a balanced draft system uses both to keep pressure near atmospheric; a cross-flow fan isn’t used to establish furnace draft in typical boilers.

A positive pressure in the boiler furnace is created by pushing air into the combustion chamber. The force draft fan does exactly that: it pushes ambient air through the air inlet into the furnace, raising the pressure inside relative to the surrounding flue path. This positive pressure drives air into the furnace, supporting steady, controlled combustion. In contrast, an induced draft fan sits on the flue gas outlet and pulls gases out, creating negative pressure inside the furnace; a balanced draft system uses both to keep pressure near atmospheric; a cross-flow fan isn’t used to establish furnace draft in typical boilers.

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