* HTF Series Fire-fighting Fume Etraction Axial Fan is a new product by optimized design, research and development it has features of hh efficiency and smooth curve. It Is beneficial for emergy-saving. it adopts motor direct driven. It can utilize single or mutti-speed transmission forms according to various requirements of the high-grade civil-purpose architectures in order to futfili the goal of ventilation， air-exchange and heat fume extraction during fire-fighting. This product is widely applicable for the occasions such as high-grade civil-purpose architectures, dry oven, underground, etc.