ZR series roof automatic fan feature  Brief introduction,  In order to satisfy the urgent ventilation demands of industry and commerce buildings, Zhongrun Machinery Co., Ltd researches and develops the ZR series roof non-power fan. ZR series roof non-power fan can effectively exhaust the hot wet and grime air indoor out, and make the fresh air entry on and on, to improve the air condition of the room. ZR series roof non-power fan, without power cost, settled the high-cost problem for ventilation, is the real environment protecting product.High ventilation efficiency.No operation cost and environment-friendly.Long service life and no need of maintenance.Reliability service, convenient installation and no leakage.