The mechanically actuated HSIN3000C ceiling inlet is designed to maximize the volume and throw of air pulled from the attic of a barn in order to improve air quality conditions. It was also designed to seal tightly in order to help prevent moisture from entering the attic space. The HSIN3000C inlet has been validated through the use of sophisticated computational fluid dynamic software, testing in the Hog Slat wind tunnel, and testing in live animal barns.