Hooded Axial Belt-Drive Roof Ventilators Max. inlet air temperature: 104FDesigned for roof-mounted exhaust or supply of clean air in factories, warehouses, and other large facilities. Heavy-gauge galvanized steel construction features hinged hood with bird screen, providing convenient access to motor and drives. Strong, weathertight hood is constructed of interlocking arched galvanized panels. Bird screen and hood come preassembled (except 54' and 60' sizes). Base requires field assembly with hardware provided. Housing, fan, and drive packages are shipped separately. Reversible exhaust/supply ventilators include wall-mounted reversing switch.