| 摘要 |
PURPOSE: A natural ventilation device is provided to automatically control the opening degree of a vent hole opening depending on the flow of air ventilated through the vent hole. CONSTITUTION: A natural ventilation device comprises a main body(A), a flap, and an actuator(C). A vent hole(11) is formed in the main body and passes through the front and rear surfaces of the main body. The flap is formed inside the main body and opens and closes the vent hole. The actuator is formed inside the main body and operates the flap. The actuator is composed of a connection unit(100) and a driving unit(200). The connection unit is formed in an end block of the main body and is connected to the flap. The driving unit is connected to the connection unit and rotates the flap.
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