Bypass damper in series-type ventilation fan

Details Bypass damper in series-type ventilation fan Bypass damper in series-type ventilation fan

1992-12-22

1993-08-17

Tapolcai, William E.

Ventilation

Having inlet airway

Including structure for mixing plural air streams together

454269, F24F 1304

Patent

active

052363937

ABSTRACT:
A series-type fan includes an air intake exposed to both ambient and forced ventilation air, a variable capacity fan, and multiple ports positioned downstream from the fan. One of the ports has a damper attached thereto which closes when the fan is de-energized to prevent backspin of the fan.

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