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It is very important for the joints between tubes to be well sealed in order to close off
potential cracks that would allow air to enter.
To ensure the chimney is airtight proceed as follows:
- Cover the outlet on the roof.
- Place paper and damp straw in the lower part of the chimney and ignite.
- Observe the potential cracks where the smoke comes out and seal them.
It is very important
for the chimney to protrude by at least one metre over the highest
part of the roof. If you need to increase the draught the height of the chimney will
have to be raised.
Ensure chimney caps do not hinder the draught.