The WJ type ventilation duct series products are a new type of ventilation duct made of inorganic refractory materials as adhesives and glass fiber as reinforcement materials. Its advantages are non combustion, easy processing, corrosion resistance, and low cost. The main varieties include rectangular straight pipes, rectangular tees, inner and outer arc bends, and rectangular reducers. The cross-section can be made circular or processed according to the specifications and dimensions provided by the user.
