Exactly what is the thickness of the fire-rated duct? A fire-rated duct ought to be built with a single pores and skin, getting a complete thickness not exceeding 2mm. This measurement consists of the intumescent coating, which is important for improving fire resistance. Based on the Entire world Wellbeing Organisation https://fireresistantductworkmanu45667.pointblog.net/fire-resisting-ductwork-specialists-secrets-89201462