A light well ventilator for disposal in a ceiling void or roof void of a room, building or the like comprises an inner housing defining a first interior space and having a first opening for the passage of airflow between the first interior space and the room, building or the like, a second opening for allowing airflow to pass between the first interior space and the exterior atmosphere, an outer housing arranged to surround the inner housing so as to define a second interior space between the inner housing and outer housing, the second interior space comprising a third opening to allow the passage of airflow between the room, building or the like and the second interior space, the inner housing having at least one perforation therein for transfer of airflow between the first interior space, and the second interior space a power source for assisting the passage of airflow through the inner housing and a control system for controlling the power source and/or the size of at least the second opening.
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