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Connection for Air Extraction
Only use smooth pipes or flexible hoses made from non-flammable materials for the extraction ducting.
To achieve the greatest possible air extraction with the lowest noise level, please note the following:
• To ensure efficient air extraction, the diameter of the exhaust ducting should not be less than
120mm.
• If flat ducting is being used, the cross-sectional area must not be smaller than the cross sectional area of the
exhaust connection.
• All ducting, pipework and fittings must be made of non-flammable materials.
• The exhaust ducting should be as short and straight as possible.
• Only use wide radius bends.
• The exhaust ducting should not be kinked or compressed.
• Ensure that all connections are strong and airtight.
• Where ducting is horizontal, it must be laid to slope away at least 1 cm per metre. This is to ensure that
condensation cannot drain back into the cooker hood.
• If the exhaust air is to be ducted into the open air, the installation of a telescopic wall vent or roof vent is
recommended.
To avoid the danger of toxic fumes, please observe the Safety Warnings.
This is especially crucial when using the cooker hood at the same time as another heating appliance
which relies on air from the same room.
The cooker hood should be installed according to local and national building regulations. Seek
approval from the building inspector where necessary.
If the exhaust ducting is to run through rooms, ceiling space etc. where there may be great variations
in temperature between the different areas, the problem of condensation will need to be addressed.
The exhaust ducting will need to be suitably insulated.
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