| 摘要 |
PROBLEM TO BE SOLVED: To improve versatility of a ventilation fan, and to provide a ventilation fan with easy selection of models and quality control not requiring per model management of stock. SOLUTION: The ventilation fan 10 is provided with blowers 14 and 15 for air supply and exhaust housed in a body casing 11, an operation control means 30 for carrying out operation control of blowing capacities of the blowers 14 and 15, an air capacity change-over switch 32 changing the operation control means 30 in multistages, and a display means 35 for displaying a switch change-over position of the air capacity change-over switch 32 by a size of a room of a building. The air capacity change-over switch 32 is composed such that a ventilation air capacity can be selectively adjusted and set in multistages by switch change-over operation. COPYRIGHT: (C)2005,JPO&NCIPI
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