Plastic roof ventilator housing and rotational casting process for mfr. of complete housing - which is sepd. into two housing parts at flange line between them and inlet and outlet openings are cut into both housing parts before assembly

摘要

In a process for prodn. of a plastic roof ventilator housing the complete housing is rotationally cast and then separated into an upper part (7) with a flange (2) at the lower edge and a lower part (8) with a flange (2) at the upper edge. Inlet (21) and outlet (20) openings are cut into both housing parts (7,8). The roof ventilator housing (7,8) made by the process is claimed.