Guarantee ducting is the proper size - if it is far too small, it is going to prohibit airflow, and In case the ducting is too big, it will lead to abnormal sound. Remove and soak in warm water with a strong hood degreaser Scrub extensively with non-abrasive brushes Purchasing https://commercialkitchenextracts12233.blog2freedom.com/37010676/a-secret-weapon-for-commercial-kitchen-extract-systems