| 摘要 |
A range hood fan is constituted of a case main body connected partly to an exhaust gas duct and forming an exhaust gas passage inside the case main body, a fan motor supported by a partition wall in the case main body and having a fan on a rotation shaft, and an exhaust gas suction opening formed in a portion open in a hood main body of the case main body. A first filter is provided at the lower part of the case main body. The first filter is formed by net structure through which gas containing oily smoke can be passed and has first grooves which are extended in a rotation direction of the fan and end portions of which are open in the exhaust gas passage. A second filter is provided inside the first filter. The second filter is formed by net structure through which gas containing oily smoke can be passed and has second grooves that are larger than the first grooves and are open in the exhaust gas passage. The gas sucked by the fan through the exhaust gas suction opening is caused to flow along each of the second grooves and of the first grooves, so that oily smoke is liquefied and collected.
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