OPERATION EXPLANATION OF COMPONENTS CREANING AIR FILTER If the air filter for the FRESH or RECIRC air intake becomes clogged, the heating capacity will drop. In places where there is a lot of dust, clean the air with compressed air once a week. For details of the cleaning method, see "CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER) (PAGE 4-51)". 3-41