... DescriptionRoof metal ventilator Functions:1. It can absorb the hot air, moisture, dust, foul smell, smoke from residence and kitchen chimneys of ... Assurance: The Base plate, Multi-angle neck, Turbine of the ventilator adopted 304 stainless steel, Aluminum-zinc Galvanized steel with 150 ... long life.3.Multi-angle neck: The neck of the ventilator can be altered as the gradient of the roof in ...