The ventilation damper is started. The ventilation damper according to the present invention includes a housing installed on a wall surface of a building; A plurality of blades rotatably mounted on the enclosure; An opening/closing driver provided in the housing and generating a driving force for rotating the plurality of blades; And a control panel receiving power from the outside and electrically connected to the opening/closing driving unit to control the opening/closing driving unit. Including, the control panel and the opening and closing driver may be arranged side by side in the front-rear direction of the housing.
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