ROC LL1GBQ24-B26CG, Руководство по использованию, установке и обслуживанию

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The boil er has been fixed on the wall ,and fix the flue rubber ring inside the
flue connector, and insert elbow into flue sleeve and then rotate it to
required position.
Tip: in the vertical axis of flue, the elbow can rotate with 360°
Before installing the flue, ensure the maximum length of flue ducting does not
exceed 5m (see picture 5.6),and consider all of elbows and its bend. You should
reduce the maximum length of the flue by 1m for each 90 ° elbow and 0.5m for
each 45° elbow.
If the flue is bought by the users,it should meet the above requirement.
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Picture 5.6