The EUX2 attaches to the cooling air emissions vent on the rear of the Honda EU2000i and EU2200i and also the international EU20i and EU22i.  The polycarbonate shroud comes with an attached collar for attachment of the four inch emission tube with a worm clamp.  The flexible, aluminum emissions tube will expand to approximately three feet from the generator. The exhaust system is designed to allow the direction of the combustion and cooling air emissions outside of an enclosure.  See also the 4GDV wall vent at generator-line.com for attachment of the aluminum flex tube to the exterior wall.