Vent

A vent that includes:

• a rotary head with blades arranged between a top and bottom section of the rotary head wherein each of the blades:
• (i) are canted inwardly from the bottom section, (ii) present a straight line profile between the top and bottom section, and (iii) taper along a height of the blades from a wider base to a narrower top wherein a profile of the blades is such that a constant distance gap is provided between overlapped regions of adjacent blades;
• a roof base component to mount the rotary head to a roof of a building, the roof base component having a throat that provides a flow path from inside the building to an interior of the rotary head;
• and a diffuser, wherein the diffuser includes an opening that allows a portion of airflow from the throat to pass through the diffuser so as to vertically split the airflow above and below the diffuser into separate airstreams whereby the airflow is vertically distributed over the height of the blades when exiting the rotary head, the vent further including a translating damper to selectively restrict the airflow passing through the vent.