The Ansi approved standard covers drive arrangements for centrifugal fans, inlet box positions for centrifugal fans, designation for rotation and discharge of centrifugal fans, motor positions for belt or chain drive centrifugal fans, operating limits for centrifugal fans, drive arrangements for tubular centrifugal fans, impeller diameters and outlet areas for industrial centrifugal fans, impeller diameters outlet areas for industrial centrifugal fans, impeller diameters and outlet areas for tubular centrifugal fans, dimensions for axial fans, and drive arrangements for axial fans.

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