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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 extractor

and the heater 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 extractor 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 must be

sought.

If the rangehood is being operated in

recirculation mode, the above

restrictions do not apply.

Warning and Safety instructions