There might be neighborhood techniques and incentives with your country to guidance the installation of fire basic safety items. Call your local office To learn more. Find your local ROCKWOOL Office environment The bare minimum duct thickness is outlined by what ever code jurisdiction which the job is found in. https://fireresistingductworkinsu70012.dm-blog.com/36870424/5-tips-about-fire-resisting-ductwork-insulation-you-can-use-today