Miele DA 249-4 Operating And Installation Instructions page 12

Operation
If the power level indicators "1" and "4"
flash, the automatic switch back is not
activated.
^ To activate the automatic switch back
press the "+" button.
The power level indicators "1" and "4"
light continuously.
^ To deactivate the automatic switch
back press the "–" button.
^ To save the setting press the Delay
Shut Down button.
If the procedure is not saved within 4
minutes of programming, the hood
will automatically default to the "old"
setting.
12
Fan performance
The maximum air flow capacity is
625 cfm. Factors such as narrow duct
diameter and bends will affect this
value.
Level 1 operates at 40% capacity
Level 2 operates at 60% capacity
Level 3 operates at 80% capacity
Level 4 operates at 100% capacity
There will also be a slight decrease in
airflow for hoods operated in
recirculation mode due to the active
charcoal filter.