Have never used an exit hose for the back but can easily be bought and attached. The item "Portable Air Conditioning Unit" is in sale since Sunday, August 19, 2018. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Air Conditioners & Heaters\Central Air Conditioners". The seller is "sgcschofield" and is located in Ashton-under-Lyne. This item can't be shipped, the buyer must pick up the item.