Axial type fan BOD

Fan is a draft blowing machine designed to move a gas-air mixture or air.
Draught blower - a rotating vane machine that transfers mechanical energy of gas in one or more impellers, thus causing a continuous flow of gas at its maximum relative compression, and is designed to move the medium in the gas-air path of boiler and other technological installations.
Multistage blower - a blower with several impellers, the design of which provides for the possibility of gas flow through all the wheels in sequence.
Air - air medium with dust content not exceeding 10 mg/m3.
Gas-air mixture - a mixture of air with other gases with dustiness not exceeding 10 mg/m3...