Manual Morso 2B Classic (page 28 of 36) (English, Danish)

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1.8 Draft conditions

If smoke spillage occurs when the re door is opened, it is probably due to poor chimney

draft. This type of stove requires at least 12 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. The smoke gas tem-

perature at the rated output is 257˚ C relative to 20˚ C.

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 eect within the ue caused by the dierence in

temperature within the ue and the cooler temperature outside. Other factors that

can inuence the level of draft include the length of the ue, insulation of the chim-

ney, adverse weather conditions or tall buildings or trees nearby the ue terminal.

Poor draft occurs when:

- The atmospheric temperature dierence is too low, e.g. a poorly insulated chimney.

If the chimney is excessively cool, it may help to ‘prime’ the ue before the re is lit.

Just place a screwed-up sheet of newspaper in the ue-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 ue gases are pushed

back down the chimney.

- Flue draft is diluted by residual air entering the chimney, e.g. due to inadequate

ue-pipe joints or leaks at the cleaning door or ue collar.

- Unsealed, unused replaces are connected to the chimney.

- The ue 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 dierence between the chimney and outside is high. This also

applies during ring, 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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Morso 2B Classic Manual

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