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1.8 Draft conditions
If smoke spillage occurs when the fire door is opened, it is probably due to poor chimney
draft. This type of stove requires at least pa of chimney draft to achieve satisfactory com-
bustion and smoke spillage prevention. However, in cases where the stove door is opened
too vigorously you could expect that slight smoke spillage may occur.
4560: the flue gas temperature at the rated output is 291˚ C relative to 20˚ C.
the flue gas flow is 4.9 gr/sec.
5060: the flue gas temperature at the rated output is 333˚ C relative to 20˚ C.
the flue gas flow is 6.6 gr/sec.
If you have any doubts, you may want to have your installer measure the draft in the chimney.
Draft conditions
the chimney’s draft is the resulting effect within the flue caused by the dif-
ference in temperature within the flue and the cooler temperature outside.
Other factors that can influence the level of draft include the length of the
flue, insulation of the chimney, adverse weather conditions or tall buildings or
trees nearby the flue terminal.
Poor draft occurs when:
• the atmospheric temperature difference is too low, e.g. a poorly insulated
chimney. If the chimney is excessively cool, it may help to ‘prime’ the flue
before the fire is lit. Just place a screwed-up sheet of newspaper in the
flue-ways of the stove and ignite.
• the outside temperature is too high, e.g. during the summer months.
• there is no air movement (wind) outside.
• the chimney is not tall enough, with the result that the terminal sits in the
lee of the roof surface or in the vicinity of tall trees or neighbouring
buildings. these conditions are also associated with downdraft where the
flue gases are pushed back down the chimney.
• Flue draft is diluted by residual air entering the chimney, e.g. due to
inadequate flue-pipe joints or leaks at the cleaning door or flue collar.
• Unsealed, unused fireplaces are connected to the chimney.
• the flue is blocked, e.g. by soot, due to inadequate cleaning, loose debris or
even a birds nest.
• the house is too tightly sealed (see section on Fresh air supply).
A good draft is achieved when:
• the temperature difference between the chimney and outside is high. this al
so applies during firing, when the need is greatest.
• the weather is clear and there is a good wind.
• the chimney is of the proper height, i.e. minimum 4 meters over the stove
and the termination adequately clear of the roof line.
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