Make sure ducting is the proper dimensions - whether it is too tiny, it'll limit airflow, and If your ducting is simply too large, it is going to cause too much sounds. Eliminate and soak in warm drinking water with a powerful hood degreaser Scrub comprehensively with non-abrasive brushes Smaller https://commercial-kitchen-extrac46788.pointblog.net/detailed-notes-on-commercial-kitchen-extract-systems-83564373