Grease or kitchen extract ductwork is usually made out of metal, typically galvanised sheet steel in a rectangular or spiral-wound circular format, but can even be produced from all-welded ‘black iron’ or stainless-steel. Our providers will allow you to achieve an optimised and thoroughly compliant industrial kitchen to agreed timescales, https://fireresistingductwork45677.wizzardsblog.com/28571943/what-does-kitchen-extract-systems-mean