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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 0.04 mbar (4 pa) is the maximum permissible in
the room.
This can be achieved by providing adequate ventilation such as 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.
The ventilation must have the appropriate cross-sectional area to
ensure an adequate supply of air.
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.
Warning and Safety instructions
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