Electrolux EFC 635 Instruction Book page 5

When used in the ducting mode the
charcoal filters are not required.
Never do flambé cooking under this
cooker hood.
Never leave frying pans unattended
during use as overheated fats and oils
can catch fire.
Do not leave naked flames under the
cooker hood.
Ensure heating areas on your hob are
covered with pots and pans when using
the hob and cooker hood simultaneously.