Looking to blend outside and conditioned air for the ultimate in comfort, quiet and economics? Carrier¡¯s Airstream unit ventilators are a breath of fresh air. Airstream unit ventilators operate with sensitive controls, so the room can be opened to outside fresh air as needed. A precision fan system provides quiet operation in environments where sound level is critical, like classrooms. In either vertical or horizontal configurations, AirStream units are cost-efficient and easy to install and maintain.