RAIS GABO Instructions For Installation, Use And Maintenance Manual page 9

ENGLISH RAIS ­ manual for Rais Gabo, Pina, Vola & Vola Soapstone
If it is found that there is excessive draught in the chimney then either an
adjustable flue damper or alternatively a draught stabiliser should be fitted. The
adjustable flue damper should not close off the flue entirely, but should in its
closed position leave a minimum continuous opening free area of at least 20 %
of the total cross sectional area of the flue or fluepipe.
Adequate provision e.g. easily accessible soot door or doors must be provided
for sweeping the chimney and connecting fluepipe.
You should also familiarise yourself with the draught conditions for chimneys
with 2 flues.
For strong draughts, the chimney or flue should be fitted with a draught
stabiliser. In which case, it is important to ensure that there is a free flow­through
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area of minimum 20 cm when the regulating gate is shut. Otherwise, the fuel
energy may not be used optimally.
If, at any time, you are unsure about the condition of the chimney, you should
contact a chimney sweep.
Remember that access to the soot door should be kept clear.
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