Radial type fan VRT

Fan - a draft blower 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.
Radial draught blower - a draught blower with the direction of meridional velocity of gas flow at the inlet of the impeller parallel to the impeller, and at the outlet of the impeller perpendicular to the axis of its rotation.
Radial single-sided suction blower - blower with a single-sided impeller.
Air - air medium with dust content not exceeding 10 mg/m3.
Gas-air mixture - mixture of air with other gases with dustiness not exceeding 10 mg/m3