Manual Nestor Martin S21 (page 49 of 77) (English, Dutch, French)

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If the flue terminal is too low in relation to the roof, or is masked by other buildings, it is possible for winds

coming from certain directions to have become so turbulent that the stove’s stabilizer will be unable to respond

quickly enough to the changing conditions. Trees often create turbulence problems that cause difficulties

because they are often overlooked in the search for the culprit. Not only are the aero-dynamics of trees changed

with the seasons and leaf growth, but a large tree may have no effect for many years and its last foot of growth

may never be suspected as the cause of a previously well controlled stove becoming erratic. No « patented »

cowl fitted to the flue terminal will overcome serious wind turbulence, but minor turbulence can often be

reduced to acceptable levels with a suitable «model» . For major turbulence problems, increasing the height of

your existing flue or demolishing the offending obstruction will be the only effective cure.

The term «down draught» is often used erroneously to explain almost any flue unable to sustain sufficient

thermally induced gas speed to overcome high pressure zones caused by winds hitting an obstruction beyond the

flue terminal. In most instances this is caused by a poor flue cooling the flue gasses and a cure would be effected

with an insulated pipe. True « down draught » affects houses situated on or near to hills, when cooling air travels

down the hillside.

This wind, called katabatic wind, can normally be controlled with an efficient flue system and suitable cowl, but if

the wind causes a high pressure zone at the flue terminal, resitting the flue to the opposite side of the house may

be the only effective answer if an otherwise satisfactory flue causes a problem. The opposite condition, when

warming air travels up a hillside giving anabatic wind, can produce very high negative flue pressures which will

sometimes necessitate a barometric damper being fitted to the flue.

Windows and doors opened down wind of prevailing winds and the running of large extraction fans without

adequate ventilation may cause the flue to stall or even become positively pressurised with potentially dangerous

consequences. Any smell of flue gasses within the house should be investigated immediately. Damp weather is

one of a multitude of atmospheric conditions blamed for poor flue « draught » . There is no theoretical or

practical foundation for these, only the existence of an oversized, cold and damp chimney needing lining and

insulating.

VENTILATION

The ventilation to provide the stove with air has to be regarded as an integral part of the flue system, because

unless the air passing through the flue is replaced with equal amounts of air entering the house, the flue will

cease to function. The colder the outside temperature and the harder the stove is working to maintain the

required temperature inside, the colder the incoming air and the greater its flow. No amount of strategically

positioned knitted draught excluders will overcome the laws of physics or your discomfort if ventilation not being

given the planning it deserves.

Any room or space containing an appliance should have a permanent ventilation opening of free area at least 550

mm2 (0.8525 square inches) for every kilowatt (3,412 BTU) of rated output above 5 kilowatts (17,060 BTU)

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Nestor Martin S21 Manual

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