Roof Ventilators are available from 2200CFM to 1,30,000 CFM at Pressure from fee air delivery to 25mm WG. or higher static pressure. The high volumes of air required for adequate ventilation of large plants can easily and most economically be handled with Aarco Roof Ventilators. These units are excellent for both general Ventilation and spot ventilation of trouble areas. The vertical discharge jets.