Airfoil Impellers stack-cap ventilators include the standard belt drive tubeaxial fan assembly. These units are designed for the roof mount ventilation where the motor exposure to the airstream cannot be tolerated. Motor mounts accommodate standard NEMA frame motors. Belt guards, motor covers, external lube lines are all standard on these units. The butterfly door assembly is aluminum constructed with phenolic shafting to provide years of problem free use. Custom construction is available.
Standard housings are fabricated using steel, but are also available in aluminum and stainless steel construction. Additionally, steel housings come standard with an enamel finish, with optional epoxy and hot dip galvanized finishes available.