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The QEID direct drive mixed flow fan is available in a roof-mounted exhaust or upblast configuration ideal for discharging clean air or fume exhaust up and away from a building. The QEID Upblast’s mixed flow wheel offers higher efficiency operation that a belt drive fan and requires less maintenance by eliminating belts, pulleys and fan shaft bearings, and a factory-programmed VFD enables easy adjustment and control. A fully-welded heavy-gauge curb cap eliminates leaks and allows for quick mounting to a roof curb. Butterfly dampers provide backflow protection and prevent rain penetration, while a windband protects the dampers from debris and keepers the damper blades closed when not in operation.