| 摘要 |
The present invention relates to a device to adjust the opening of a door for a fume hood wherein a weight pendulum is connected to a door installed on a fume hood so that the door can maintain a balance by the center of gravity; the weight pendulum is composed of a fixed pendulum and an auxiliary pendulum; and the auxiliary is supported by a weight-adjusting piece installed to vertically pass only the fixed pendulum so that the door can automatically maintain the opening of a specific height. |
