Centrifugal wind chassis have fire smoke ventilation type and of two types. Fire smoke type with high temperature structural panels, motors and drive components are positioned in the wind outside the box end. 280 ℃ or more can be discharged flue gas temperature more than 100 minutes of continuous operation. All-metal frame and removable posts within the insulation panel in field-removable, flexible placement. With multi-directional air inlet and outlet, the unit can be ceiling mounted, floor-mounted, easy to install at the same time conducive to engineering design.