Our range of professional roof extract fans is rounded off by new certified and DIBt approved roof smoke-extract fans. These models can operate for two ours at temperatures of 400 °C or 600 °C. Extraction rates of up to approx. 58,000 cbm/h are achieved with two times 23 types. Smoke-extract roof fans of the lines RDM 56 and RDM 57 are provided for eliminating heat and smoke in case of fire especially in the first phase with usually high smoke content. They have to keep the escape ways smoke free, reduce damages, and ease fire fighting actions. The advantages of the ER at a glance: Air discharge vertical and swirl free. Casing made of aluminium. Base frame and mechanically stressed parts made of galvanized sheet steel. Impeller made of steel, welded and coated. Motor separated from air stream. Casing side parts removable, centre parts to be swivelled (up to size 7190). Ready for connection; free cable lead, protected by a steel tube. Fixing bracket for isolator switch or connection box as a standard. Isolator switch as an option (loose for fitting on site)