Streamlined wall-mounted evaporators extend as little as 7" from the wall to accommodate most room configurations. The Indoor unit (evaporator) is mounted inside the room, enclosed in a neat and handsome space saving cabinet. It is connected to the outdoor unit (condenser) via refrigerant lines & inter-unit wiring through a 3 1/2" opening in the wall. Since no ductwork is required, installation is simple. fast & efficient. There is no need to use up window space or cut large openings in existing walls, which could undermine the integrity of your structure, and even pose security risks