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As far as the warm air moves in the stove pipe the low pressure is generated in the place of the stove
connection to the stove pipe. The greater pressure from the outside of the stove makes the air move into the
area of lower pressure – into the area of fire box. Thus the air intake into the fire chamber happens. This
constant air inflow is the draught.
The stove won’t be operating effectively if there is no draught of the definite value.
The optimal draught for operation of stoves of «Termofor» trademark equals to 12±2 Pa.
Provided the excessive draught the considerable air flow will be entering the fire chamber and this will
lead to the stove overheating. Fire hazard may appear.
With the insufficient draught the insufficient amount of air for fuel proper and complete combustion
will be entering the fire chamber and this may lead to smoke generation in the room. The creosote
generation increases upon the formation of excessive smoke in the stove pipe and that may ignite creating
the fire hazard in a house.
Creosote — is colourless (sometimes yellowish or yellow-green), inflammable, hardly soluble in
water oily liquid with strong smell and pungent taste extracted from wood and coal tar. This is the mixture
of phenols mainly guaiacol and cresols. Soluble in alcohol and ether. Poisonous.
Creosote will inevitably be generated in your stove and stove pipe. To reduce the speed of its
generating it is necessary to:
Use only dried billets that were dried during the period for not less than one year.
Use hardwood of broadleaf woods that is more compact (more heavy) and combust with the higher
temperature.
Before the use of the stove check and amend all that can influence the draught. Reducing or increasing
of draught may influence the draught by set of different factors, some of them may change in the course of
time. Factors influencing the draught:
Atmospheric pressure – may act from outside of a room, from inside and from both side by turns.
Weather conditions to which the high pressure conforms (clear and cold days) usually create the perfect
conditions for combustion.
Negative pressure outside the heated room – is created with the help of ventilation facilities such as:
ventilation inside the sauna room, draft hood, equipment for clothes drying, boilers with forced draught.
Upon the negative pressure the air flow in the stove pipe will go backwards at that ―negative draught‖ or
―backdraught‖ is created.
Negative pressure can be neutralized by opening the door or window in the room with the stove.
The stove pipe temperature – the draught in the warmed up stove pipe is better than in the cold one.
The cold stove pipe quickly cools off hot gases going upwards and this will prevent their further going
upwards. Combustion of the first fuel charge will be enough for the stove pipe warming.
Stone stove pipes and stove pipes with section larger than the heating device are warmed up for a
considerably longer period of time.
The chimney stack shall have minimal number of elbows. The straight pipe is preferable. The use of
more than two piping may lead to the draught loss and possible smoke generation.
The manufacturer recommends to use modular thin-walled chimney stacks made of high-alloy,
corrosion-resisting steel of «Termofor» trademark with the diameter of 115 mm. They are effective, durable
and required thee minimum expenses for assembling and during operating.
For reliable fastening of the units together it is necessary to use «collar-strainer»; the use of self-
drilling screws is allowed if necessary.
