4. Fluid reaction surfaces (i.e., impellers)
  5. Rotor having flow confining or deflecting web, shroud or...
  6. Radially extending web or end plate

Penn Ventilator Co. Inc.

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Apparatus and method for starting and controlling a motor

Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent

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Centrifugal ventilator fan

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Patent

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Ventilator fan device

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Patent

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