目前,北方地区民用住宅中常需设烟道和通风道,常规作法为砖砌或混凝土预制。这两种作法都有一定弊病。砖砌烟道、风道,体积较大,且内壁不光滑,留洞尺寸往往不规矩,使用效果不理想,尤其是烟道,时间长了,内壁挂满了油污,向下流淌并影响排烟,而且还不易清通。混凝土预制烟道、风道, At present, flue ducts and ventilation ducts are often required in residential houses in the northern regions. The conventional practice is brick or concrete prefabrication. Both of these practices have certain drawbacks. Brick chimneys and ducts are large in size, and the inner wall is not smooth. The size of the holes is often irregular, and the use effect is not satisfactory. In particular, the flue gas has a long time, the wall is full of oil, and it flows down and affects the row. Smoke, but also difficult to clear. Concrete prefabricated flue, duct,