Type D blowing machines are produced of right and left rotation: with right rotation, the impeller rotates clockwise when looking at the wheel from the engine side, with left rotation - counterclockwise. The snail of machines D is made with a turning angle of 0 ° to 270 ° every 15 °, while the ribs of the snail that interfere with the installation are cut.
Centrifugal smoke exhausters, double suction type D x 2, are designed to exhaust flue gases from furnaces of stationary steam boilers. Pulverized coal boilers with a balanced draft steam capacity of 220 ... 480 t / h, equipped with efficiently operating ash collectors (residual dust content of flue gases no more than 1 g / m³) are equipped with smoke exhausters gas-oil boilers with balanced draft of the same steam capacity. The smoke exhausters provide the parameters of the gas paths of the boilers when two machines are installed on the splitter.