Chateau Hoods
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3. VENTILATION REQUIREMENTS
Requirements of the relevant authorities concerning the discharge of exhaust air must be complied with.
Never use ducting that is smaller in diameter than the outlet spigot diameter of your cooker hood (see
Specifications). If you are connecting into a rectangular duct you must ensure that the cross-sectional
area of this duct is the same or larger than that of the outlet spigot.
Install ducting before fitting the hood to the wall to prevent debris entering the appliance. We recommend
the final connection at the cooker hood exhaust spigot is done using semi-rigid ducting for easier fitting
and removal and to provide tolerance for any misalignment between the extractor spigot and fixed
ductwork.
Note: We recommend duct holes are 25mm larger than the ducting to enable cables to run alongside
(such as remote motor or power cables) and to make installing ducting easier.
4. FIRE SAFETY
To reduce fire hazards, use metal ducting components.
Pay particular attention to fire risk when frying.
Do not flambé under the extractor.
To minimise the risk of fire, all instructions relating to cleaning the grease filters and removing grease
deposits must be adhered to.
5. COOKER HOOD PERFORMANCE
The most important influence on the performance of the extractor is the design of the ducting which takes
the exhaust air from the extractor to the outside.
Never use ducting that is smaller in diameter than the outlet spigot diameter of your cooker hood (see
Specifications). If you are connecting into a rectangular duct you must ensure that the cross-sectional
area of this duct is the same or larger than that of the outlet spigot.
The duct route length should be kept as short as possible with as few bends as possible.
A route with more than two 90-degree bends can significantly degrade the performance of the extraction
system.
WARNING
Proper care must be taken to ensure that the negative pressures caused by high performance
extraction systems do not adversely affect the safe operation of certain types of fuel-burning appliances
(gas, oil or solid fuel), including those installed in the kitchen and possibly also those installed in other
parts of the house.
Where such fuel-burning appliances are installed, adequate ventilation MUST be provided in the room
of installation, located and sized such that the negative pressure in the room created by the extractor
does not exceed 4Pa.
In case of doubt, do not operate the extractor and fuel-burning appliance(s) simultaneously and consult
an appropriate (for the fuel type) expert for advice.
WARNING
The exhaust air must not be discharged into a flue which is used for exhausting fumes from
appliances supplied with energy other than electricity, e.g. oil or gas-fired central heating boilers,
gas-fired water heaters, etc.
