SENKO cookers SG –
Instruction manual
9
Ascending wind ALWAYS has the effect of increasing the pressure,
i.e., underpressure (flue draught), provided the chimney is properly
installed. Descending wind ALWAYS has the effect of decreasing the
draught
overpressure occurs. Apart from wind direction and velocity,
chimney position in relation to the house roof and surrounding area is also
important (
Figure 3
).
The wind also influences the chimney function indirectly by creating
areas of high (overpressure) and low (underpressure) pressure, both inside
and outside the residential area (
Figure 4
).
Pressure that facilitates chimney function can occur in rooms directly
exposed to the wind (B), but it can also adversely affect the chimney
through external pressure if the chimney is situated on the side exposed to
wind (A). Contrary to that, underpressure can occur in lee rooms (C),
adversely affecting functions of the chimney situated on the opposite side
(D) from the wind direction.
Figure 3
wind
Un
favorable
position
Favorable
position
Horizontal wind
8 m/s
underpressure of
30 Pa
Descending wind
under
45
angle and 8 m/s
overpressure of 17 Pa
High (positive)
pressure zone
OVERPRESSURE
Low (negative)
pressure zone
UNDERPRESSURE
Flue
gases
from the
cooker
