How often should I clean the air filter?
During periods of normal use, the air filters should be cleaned every two weeks. Dust can be removed with a vacuum cleaner or by washing the filter in a solution of neutral detergent and warm water. If washed, the filter must be allowed to dry thoroughly in a shady place before reinstalling. (Page 13)
From the official Fujitsu Inverter Halcyon manual, page 13
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