... ducting, flexible hose, aluminum flexible ducting, aluminium flexible ducting, flexible duct, acoustic, insulated, combi ducting, flexible hose, aluminum flexible ducting, aluminiumAluminium Flexible DuctingApplication: ... there is no separation from the duct material. The Combi-Flex is covered with a ... entering the airstream), 25mm or 50mm fibreglass insulation and a vapour barrier jacket. The jacket ...