Patent ID: 6966356

Claim:
An air-ventilator comprising: a main housing, having first and second air-compartments along which first and second air streams respectively flow during operation, first and second air-moving devices respectively disposed in said first and second air-compartments for moving said first and second air streams respectively along said first and second air-compartments during operation, a thermal exchanger providing thermal exchange between said first and second air streams without mixing of said air streams, an air filter disposed at the upstream end of said first air-compartment, and a centrifugal fan disposed in said first air-compartment in series with said first air-moving device, adjacent said air filter and intermediate said thermal exchanger and said air filter, to provide additional suction power to move additional air from said air filter towards said thermal exchanger whereby loss in air flow due to clogging or partial clogging of said air filter is compensated, said centrifugal fan comprising deflection means to deflect said first air stream whereby said first air stream undergoes a substantially orthogonal deflection upon transit through said centrifugal fan, and said first air compartment comprising means for further deflecting the first air stream after exit from said centrifugal fan and before reaching said first air-moving device, the further deflection by said first air compartment being also substantially orthogonal and directing said first air stream towards said first air-moving device.