Round duct reducer from 100mm to 150mm. This one-piece molded ABS reducer provides a secure, leak-proof connection with excellent sealing and wear resistance. Smooth interior surface reduces wind resistance and ensures efficient airflow. Ideal for use in various ventilation applications including whole house ventilation, bathroom fans, kitchen extractor fans, clothes dryers, hydroponics, range hoods, air conditioning, and heat recovery systems. Suitable for both rigid plastic duct systems and flexible ducts. For rigid systems, seal with duct tape or putty. For flexible ducts, secure with a hose clamp. Durable ABS construction offers high strength and corrosion resistance. Universal indoor and outdoor use. Easy to install with a seamless design for optimal performance. Installation: 1. Attach the duct reducer to the pipe. 2. Secure the connection with aluminum foil tape. 3. Place a hose clamp over the joint and tighten with a screwdriver.