... and equipment, ridge ventilator has many advantages such as: No power cost; Silent running, No operating cost, No maintenance cost, ... has been widely used in hot workshop, especially in electric power, metallurgy, chemical industry, light industry, electronics and shipbuilding industry ... .114SKYVENT-S-1001000017500580011401.115SKYVENT-S-1201200019000650014501.1 Skyaxis Wind Power Roof Ridge Ventilator