Be certain ducting is the correct measurement - whether it is as well smaller, it will limit airflow, and If your ducting is just too big, it can trigger too much sound. Air recirculation have to be thought of for if a commercial kitchen ventilation program is to operate effectively. https://grease-tight-extract-duct46677.targetblogs.com/37272593/considerations-to-know-about-grease-tight-extract-ductwork