Totally encapsulated in aluminium foil for cleaner installation and resistance to grease or humidity ingress in support Customarily, all ductwork used to be fabricated from metal. It required currently being encased in a fire safety process when passing through a compartment wall or floor with no support of the fire https://deanqetgu.gynoblog.com/35950303/the-smart-trick-of-fire-rated-insulation-for-ductworth-that-no-one-is-discussing