| Downblast discharge design exhausts foul air from industrial and commercial buildings | Durable spun aluminum construction with steel support braces | Backward inclined aluminum fan wheel | Externally cooled motor compartment | Inlet temperatures up to 170°F | Built-in bird screen to protect discharge and ensure safe, obstruction-free operation | Motor and wheel are easily detachable without removing ventilator from curb | Uni-Mount motor structure | Junction box mounted in motor compartment | Welded curb cap corners eliminate water entry into ducts or building | Permanently Lubricated Ball bearing motors and variable pitch drives are packed separately when ordered with ventilators | All ventilators are UL Standard 705 listed when sold complete with motor and variable pitch drive | All motor and drive packages comply with the minimum efficiency levels of EPAct of ‘92 Affected motors bear the EE seal | Ventilators are CSA listed according to Standard C222 No 113-M1984 (Fans & Ventilators) | Available Accessories include: Fixed Ventilated mounting curbs, Disconnect switches, and Backdraft Dampers For more information, see Power Roof Ventilator Accessories | Speed Control N/A | Belt-drive downblast ventilators are designed for roof mounted exhaust of commercial and industrial buildings.