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Industrial SDS-R High Efficiency Tunnel Jet Ventilation Fan, Axial Flow Fire Smoke Exhaust Fan for Highway & Metro Tunnels, Find Details and Price about Centrifugal Fan Ventilation Fan from Industrial SDS-R High Efficiency Tunnel Jet Ventilation Fan, Axial Flow Fire Smoke Exhaust Fan for Highway & Metro Tunnels - Zhejiang Juying Fan Industry Co., Ltd.