The terms flue and chimney are often used interchangeably. The flue is the working part of the chimney, conveying the products of combustion safely to the atmosphere. The chimney includes the shaft within which the flue is housed. A flue works under negative pressure drawing the product of combustion from the appliance.
A successful “chimney draw” is dependent on the following principles:
- The difference in air pressure between the appliance and the top of the chimney. (created by the height of the chimney)
- The difference in temperature between the appliance’s exhaust gas and the outside temperature.
- The quality of insulation along the length of the chimney.
- The route of chimney. (The straighter and more vertical the chimney the better).
It is essential to choose a flue diameter that matches the output from the appliance. An adequate air supply is also required for the appliance to operate safely and efficiently
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