| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilation apparatus that can be installed in a building compactly and inexpensively, and cannot be affected by a gust of wind being generated outside the building. SOLUTION: The ventilation apparatus 1 comprises a frame 5 having a passage 4 that has an inlet hole 2 and an outlet hole 3 inside, a fin 6 arranged rotatably in the frame 5 so that the passage 4 is opened or closed by rotation based on airflow passing through the passage 4, and an opening/closing lid 7 that opens or closes the outlet hole 3. The fin 6 comprises a rod section 35 that is supported by the frame 6 rotatably, and a pair of fin bodies 36 and 36 being extended in one piece in a diameter direction from the shaft section 35. The fin 6 is constantly energized so that it can be rotated in an A direction, and tip sections 41 and 42 of the fin body sections 36 and 37 are curved to generate rotary moment in a B direction in the fin 6 due to airflow that passes the passage 4. |
