| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter unit temporarily fixed by a simple operation in fitting the filter unit and capable of greatly improving the fitting workability. SOLUTION: This filter unit 1 is formed with an upper side bent piece 2c in the upper side in the rear surface of a frame part 2b and a lower side bent piece 2d in the lower side. The upper side bent piece 2c is approximately vertically bent upward and the lower side bent piece 2d is bent by being downward curved, the dimension from the tip of the upper side bent piece 2c to the tip of the lower side bent piece 2d is larger than the longitudinal dimension of an opening part 6b, and the dimension from the base end part 2e to the tip of the lower side bent piece 2d is formed smaller than the longitudinal dimension of the opening part 6b. After the upper end bent piece 2c of the filter unit 1 is fitted to the upper side of the opening part 6b, the lower side bent piece 2d is hung to the lower side of the opening part 6b so as to be temporarily fixed. |
