Signature SHD901X Manuel D'utilisation page 64

3. If the carbon filter needs to be replaced, please turn it in the
anti-clockwise direction.
NOTE:
Make sure the carbon filter is securely locked.

When the carbon filter is installed, the suction of the cooker

hood will be reduced.
The carbon filter should be changed every 2-4 months

depending on the conditions of use.
EN-25