BUILT-IN RECTANGULAR-SECTION CENTRIFUGAL FAN Russian patent published in 2002 - IPC

FIELD: forced and exhaust ventilation and air conditioning systems. SUBSTANCE: proposed built-in centrifugal fan has rectangular-section housing made of thin-sheet zinc-placed steel or aluminum with flanges, drum-type one-side suction impeller with forward-curved or backward-curved blades, single-phase or three-phase electric motor with external rotor built into impeller, internal rigid support for electric motor, condenser and inlet branch pipe. Stamped steel or plastic branch pipe is free being secured between flanges of fan housing and air duct and, similar to intake one, it can serve as adapter to round section of pressure air duct being secured by quick-release eccentric clamps. EFFECT: provision of construction of built-in centrifugal fan directly coupled with rectangular section air ducts for installation in any required position. 4 cl, 5 dwg