Warning and Safety instructions
In order to ensure safe operation, and to prevent gases given off by the heating appliances from being drawn back into the room when the cooker hood and the heating appliance are in operation simultaneously, an underpressure in the room of 0.04 mbar (4 pa) is the maximum permissible.
Ventilation can be maintained by air inlets which cannot be blocked, in windows, doors and outside wall vents, or by other technical measures, such as ensuring that the cooker hood can only be switched on when the heating appliance is switched off or vice versa. A ventilation brick alone is not generally sufficient to ensure safe ventilation.
The overall ventilation condition of the dwelling must be taken into account. If in any doubt, the advice of a competent builder or, for gas, a qualified gas fitter (GasSafe registered in the UK) or electrician must be sought.
If the hood is being operated in recirculation mode, the above restrictions do not apply.
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