Cast Tec POLARIS INTEGRA INSET ARCH ECO Installation And Operating Instructions Manual page 13

Polaris Integra Arch Eco Manual Ref No: I17. V2.
DOWN DRAUGHTS
However well designed constructed and positioned,
the satisfactory performance of the flue can be
Figure 9
adversely affected by down draught caused by
nearby hills, adjacent tall buildings or trees. These
can deflect wind to blow directly down the flue or
create a zone of low pressure over the terminal. A
suitable anti-down draught terminal or cowl will
usually effectively combat direct down blow but no
cowl is likely to prevent down draught due to a low
pressure zone. (See Fig.9.)
VENTILATION AND COMBUSTION AIR
REQUIREMENTS
This appliance is rated less than 5kW, therefore
there is no mandatory requirements for additional
air unless a flue draught stabiliser is fitted then the
air requirement is 15 cm². However, we suggest that
it is advantageous to provide an air supply into the
room.
When calculating combustion air requirements for
this appliance use the following equation: 550 mm².
per each kW of rated output above 5 kW should be
provided, where a flue draught stabiliser is used the
total free area shall be increased by 300 mm² for
each kW of rated output. If there is another
appliance using air fitted in the same or adjacent
room, it will be necessary to provide an additional
air supply.
All materials used in the manufacture of air vents
should be such that the vent is dimensionally stable,
corrosion resistant, and no provision for closure.
The effective free area of any vent should be ascertained before installation. The effect of
any grills should be allowed for when determining the effective free area of any vent.
Air vents direct to the outside of the building should be located so that any air current
produced will not pass through normally occupied areas of the room.
13 Cast Tec Ltd