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Fresh air supplyFresh air supply
Fresh air supplyFresh air supply
Fresh air supply
Every stove needs air for combustion. In order to determine the correct amount of
ventilation required you should consult the current issue of Building Regulations.
Additional ventilation may also be required where the house or room is particularly
‘tight’ or where an extraction hood has been fitted.If insufficient combustion air is
provided, the chimney draught will be too weak, and this will prevent the stove
from burning adequately causing smoke spillage into the room especially when the
fire door is opened.
1.7 Chimney draught1.7 Chimney draught
1.7 Chimney draught1.7 Chimney draught
1.7 Chimney draught
Poor chimney draught is evident when it is hard to establish a bright fire or if there
is evidence of smoke spillage. For this type of stove a chimney draught of at least
0.6wg is required in order to give satisfactory combustion. However, there is also a
risk of smoke leakage if the stove door is opened too quickly whilst the fire is burn-
ing strongly.
Poor chimney draught can be caused by any of the following:
• Excessively cold chimney.
• Blocked flue-ways in either the stove or the chimney.
• Insufficient room air for combustion.
• Insufficient chimney height or termination point.
• Downdraught.
• Cracks in the chimney dilute the draught.
• The cross-sectional area of the flue is too great.
