Warning and Safety instructions
This also applies to recirculation mode if the air is being directed out of the kitchen.
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 heater are in operation simultaneously, an underpressure of
0.04mbar (4 pa) is the maximum permissible in the room.
Ventilation can be maintained by air inlets which must not 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) must be sought.
If the hood is being operated in recirculation mode and the air is being directed back into the kitchen, the above restrictions do not apply.
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