Radial type fan VRVD

Fan - a draft blower designed to move a gas-air mixture or air.
Blower - a rotating vane machine that transfers the 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 process plants.
Radial draft blower of double-sided suction - a draft blower with a double-sided impeller consisting of two impellers of a radial draft blower of single-sided suction, which are mirror images of one to the other, with a common rear (main) disc. In this case, the draft blower has two inlets and a spiral casing with a width twice the width of the radial draft blower of single-sided suction.