VD and D type blowing machines are produced in right and left rotation. With right rotation, the impeller rotates clockwise, when looking at the wheel from the side of the electric motor, with left rotation, counterclockwise. The snail of the VD and D machines are made with a turning angle from 0 ° to 270 ° every 15 °, while the ribs of the snail interfering installation are cropped.
Centrifugal smoke exhausters type D are designed to move flue gases and non-explosive dust-gas-air mixtures with temperatures from -30 ° С to + 200 ° С, dust content up to 2 g / m³. The abrasiveness of the dust contained in the transported medium and its tendency to adhere should not exceed that of flue gas ash.
Smoke exhausters are used to remove flue gases from furnaces of stationary steam and hot water boilers, to move dust-gas-air mixtures in technological installations, etc.