18
Part No. 5106463
Pre-Installation Requirements
Combustion & Ventilation Air for Balanced Flue Oil Fired Boilers
FREE AREAS OF GRILLES ARE mm
2
PER/KW OF APPLIANCE RATING (OUTPUT)
Balanced Flue
Boilers fitted with balanced flues must only fire Kerosine and will not operate satisfactorily unless the free air requirements
have been satisfied.
Consideration should be given to the texture of the wall onto which the low level flue terminal is fixed. As with all heat
emitting devices the warm air from the terminal will encourage the accumulation of dirt which will at some time require
removal with a detergent based cleaning fluid.
Clearances are shown on the next page.
Fig. 12
Extract Fans
If the room in which the appliance is located also has an
extract fan the performance of the appliance must be
unaffected when the fan is running with all doors and
windows closed.
Draught Breaks
When an appliance with a draught break is fitted in a room
add 550mm
2
/kW to the free area of the combustion air
inlet.
When an appliance with a draught break in a compartment
which is ventilated as noted above, no additional allowance
is required.