| 摘要 |
<P>PROBLEM TO BE SOLVED: To minimize lowering of ventilation air volume while suppressing an overload operation of air distribution fans even when clogging is found on filters, in a ventilation device comprising the air distribution fans and the filters. <P>SOLUTION: This ventilation device comprises the air distribution fans 4, 5, the filters 6, 7 collecting dust included in the airflow produced by the air distribution fans 4, 5, and a control portion 8 for increasing a target rotational frequency ns of the air distribution fans 4, 5 at prescribed frequency by using a time input value ts for allowing a notifying portion 9 to output a filter sign. <P>COPYRIGHT: (C)2009,JPO&INPIT |
