DWT-I series roof-mounted axial exhaust fan for industrial and commercial building roof ventilation. Designed for reliable top-of-building exhaust with weather protection. Key features: roof-mounted design, weather-resistant construction, stable performance, easy maintenance. Specifications: airflow 500~50,000 m3/h; pressure 60~400 Pa; motor power 0.06~11 kW. Applications: factory roofs, warehouses, commercial buildings, gymnasiums. Certifications: CCC, CE, ISO 9001, ATEX (optional). MOQ 1 unit, lead time 15-30 working days, warranty 18 months, OEM/ODM available.