FAN STACK, FAN WITH SUCH STACK, AND DEVICE WITH SUCH FANS Russian patent published in 2017 - IPC F04D29/54 

FIELD: ventilation.

SUBSTANCE: fan stack has a wall (8), which covers the inlet hole with circular cross section, getting across the height of the wall (8) of the fan stack (4) at the coal cross section at the fan stack release(4). At junctions (15) between the sides (34-37) of the wall (8) there is the screw-shape, which follows to the air flow twisting through the fan stack. The fan is equipped with such fan stack. The device has a housing, which has at least two fans, in each case with a fan stack.

EFFECT: improved performance characteristics of these devices.

25 cl, 16 dwg