The minimum duct thickness is outlined by whatever code jurisdiction which the task is situated in. Underneath are two code references associated with the needed thickness and content type for grease ducts. Blauberg is probably the major commercial kitchen ventilation producers in the united kingdom, trustworthy by consultants and contractors https://commercialkitchenextracts24677.blogrelation.com/43191136/commercial-kitchen-extract-systems-an-overview