100mm to 80mm Round Hose End. This is part of our 100mm round ducting range and is traditionally used along fans or mechanical heat recovery systems. The EK0082 100mm to 80mm Diameter Round Hose End is manufactured from white Polypropylene and has a minimum free area of 7088mm­² on the 100mm spigot and 4242mm² on the 80mm spigot. EK0082 is manufactured in compliance with Domestic Plastic Ductwork Specification DW/154 and does meet UL94HB flammability standard.