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The exhaust air is conducted upwards via a ventilation
shaft or directly through the outside wall into the
atmosphere.
The exhaust air must not be conveyed into a function
smoke flue or exhaust-gas flue or into a shaft which
vents a room with a fireplace.
Conveyance of exhaust air in a non-functioning smoke
flue or exhaust-gas flue requires the prior consent of an
appropriate heating engineer.
If the extractor hood is in exhaust-gas mode and a
flue-type heater is running at the same time (e.g. gas, oil
or solid-fuel heaters, continuous-flow heaters, water
heaters), ensure that the fireplace has an adequate air
supply for combustion.
Safe operation requires that the low air pressure in the
room in which the fire place is located does not exceed 4
Pa.
This low air pressure can be obtained, provided
combustion air can escape through non-lockable
openings, e. g. in doors, windows, air-intake/exhaust-air
wall boxes or by other technical procedures, such as
reciprocal interlocking, etc.
Exhaust-air mode
When assessing the air pressure, the entire ventilation system in the house/apartment must be
taken into account, e.g. hob and/or gas cooker, this rule does not apply.
Government regulations must be observed for the conveyance of exhaust air
If the extractor hood is used in circulating-air mode-with activated carbon filter-, there are no
operating restrictions.
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