Cleaning the Filters
Push the Pre-Filter to the right to take it out.
Clean the Pre-Filter with vacuum cleaner or soft brush.
If the contamination is severe, wash with water using neutral detergent. (Do not use hot water of 40 \ or higher.)
The cleaning period for Pre-Filter is 1 month.
Completely dry in shade and push to the left until the Pre-Filter is not pushed anymore.
Caution
For the safety, pull out the power plug before cleaning.
Be careful not to damage the Pre-Filter when using a vacuum cleaner.
After washing the Pre-Filter with water, completely dry it in shadow.