Genuine Toshiba owner's manual. Couldn't really ask for more. And written in understandable English in contrast to a few recent experiences I have had with manuals for other equipment other than Toshiba but made in China and written in "Chinglish"!
Text excerpt from page 6 (click to view)
MAINTENANCE AND CLEANING
Before carrying out any maintenance or cleaning isolate the cooker hood from the mains supply. The cooker hood must be kept clean, as a build up of grease or fat can be a fire hazard.
Wipe the cooker hood frequently with warm soapy water using a mild detergent.
Always wear protective gloves when cleaning the hood. Never use scouring pads or abrasive cleaners. Never use excessive amounts of water when cleaning particularly around the control panel.
The charcoal filter cannot be cleaned, it should be replaced approximately every three months or more often if the hood is used for more than three hours per day. (See installing the cooker hood for instructions on how to remove the charcoal filter).
K To Remove/Replace the Charcoal Filter
1. Remove the thumb screw through the centre of the charcoal filter, from the motor support. The charcoal filter can now be removed.