heating ventilation air conditioning system, and it is designed especially to be used in accordance with the passage of air particles in industrial areas. The 750 denier polyester fabric is thick heavy fortified with high impact PVC pipe ileüretil have. Abrasion resistance is high. It is highly resistant to physical shocks. So as to prevent particles adhering to the inner surface of the inner surface is smooth. It was produced with an antistatic material which prevents adhesion of the particles. flexible ventilation pipes are designed to be used in industry.