good info on previous posts... Not many options if you are on a slab - If your joists are hung inside the foundation walls, like DH said then maybe you can just come up inside a base cabinet, if you have one up against an outside wall that is convenient. The duct would come up through the floor, into the base cabinet, and then out the wall behind it (don't hit plumbing or electric wires!). Most of this might even be able to happen in the toe kick space, but you would still have to remove some of the floor of the cabinet, at least temporarily to get at it. Remember to use only sheetmetal ductwork, and have the flanges go in the right direction. If you have normal joist floor and outside band joist then just go through the band or rim joist as DH said - couldn't be easier. This unit DOES need to be vented to outside to use.