- Versatile Compatibility: Our 3 to 6 inch Duct Adapter is essential for any HVAC ventilation system. It effortlessly connects ducts of varying sizes, including 3.14'', 3.93'', 4.72'', 4.92'', and 5.90'' (80 – 100 – 120 – 125 – 150 mm). Use it as a reducer or increaser to meet your specific installation needs. - Durable Construction: Crafted from high-quality plastic, this duct adapter is designed to endure temperature fluctuations and resist corrosion. Its robust build is ideal for HVAC applications, ensuring reliability in air conditioning, heating, and cooling systems with an operating temperature range of 0°C to +90°C. - Hassle-Free Installation: Installing our Universal Reducer Increaser Connector is straightforward. Simply attach the adapter to your intended duct size, whether reducing or increasing, and integrate it seamlessly into your ventilation system. This quick setup saves you time and effort. - Optimized Airflow Control: The smart design of the duct inline reducer increaser connector guarantees effective airflow management. Adjust airflow easily to enhance heating, cooling, or air circulation according to your needs. Enjoy improved air distribution and comfort in your space, contributing to energy efficiency. Use Scenarios: 1. Upgrade your home HVAC system by connecting different duct sizes for better efficiency. 2. Use in commercial settings to adapt ventilation for various equipment and room layouts. 3. Ideal for DIY projects where custom ductwork is needed for optimal air distribution.