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Mechanical forced draught is provided by

Mechanical forced draught is provided by means of a fan forcing air into the combustion chamber air is often passed through an air heater; which, as the name suggests, heats the air going into the furnace in order to increase the overall efficiency of the boiler dampers are used to control the quantity of air admitted to the furnace forced draught furnaces usually have a positive pressure. If you need help with your blocked sewer drain or blocked.

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