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ÜKY/DUO Boiler User Manual
flue pipe shall be made of steel sheet or material which is resistant to 400 °C. All connections on the
exhaust gas pipe must be sealed to obtain better combustion and efficiency. The exhaust gas pipe
must be connected to the chimney in the shortest way within the dimensions given in the diagram
below. Horizontal connections and equipment such as elbows should be avoided.
A vertical steel pipe should not be used as a chimney; the chimney must have an inside and an outer
surface. The outer surface may be steel or brick braided. For the inner surface of the chimney,
corrosion-resistant stainless steel may be preferred. In order to prevent condensation, thermal
insulation should be applied to the space between the inner and outer surfaces of the chimney.
At the lowest level of the chimney, there must be a cleaning lid made of steel that is sealed.
The length of the exhaust gas pipe between the chimney and the boiler must not exceed a quarter of
the height of the chimney.
The size of the waste gas pipe and the chimney should be greater than the size of the waste gas
outlet (fumes) of the boiler. The boiler chimney installed must be at least 1 meter above the roof of
the space and at least 0.4 meter above the tiled roofs.
Chimney without flue hat and with flue hat
Incorrect installation chimney and correctly
installed chimney hat
Excess air at high flue temperature, high flue temperature also causes loss of combustion
efficiency.
