| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for expanding a filter frame. SOLUTION: An auxiliary plate closing a gap generated between the outer peripheral part of a filter frame 200 and a filter frame arranging place is fixed to the outer peripheral part of the frame 200 by clips 42, 42a, 42b. The corner constituting members 40 of the filter frame 200 and the side constituting members 41 thereof are overlapped and the lengths of the overlapped parts of them are adjusted to make it possible to adjust the filter frame 200 to an arbitrary size and the overlapped parts are fixed by clips 42, 42a, 42b. |
