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2.4
Ducting
The chimney must either be placed under a powered exhaust hood, or connected directly to a
76mm duct (not supplied) to the outside of the building; any such duct must NOT have powered
extraction.
The fumes should be ducted by either of the above methods to at least 1m above the level of the
building.
Rules for ducting:
Ducting diameter must be 76mm or more. Ducting must be 76mm where it connects to
the chimney.
Ducting length must not exceed 3m for 76mm diameter; for longer lengths consult a
ducting engineer.
Flexible ducting, if used, must be suitable for exhaust gas extraction.
If an extraction fan is fitted an extraction hood is required with free flow of air around the
chimney.
Do not connect more than one unit to a single duct. Exception: fanned duct with hoods.
MF58 – 1.06
5
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