Exhaust up to 15 metres permanently attached and stored inside unit Removable water tank with auto cut off or continuous drainage option Spot cool attachment supplied 18 inch each but can be up to 7.5 metres each Distance to external wall based on exhaust duct plus spot cooling maximums The Powerful Ozone friendly (R417A) KCA23 Portable Air Conditioner has a 23000 BTU cooling capacity and is able to cool an area of upto 100 sq metres. This air conditioner comes with an standard 2.5 metre exhaust pipe but you can be extended this upto 15 metres (extra pipe sold separately) for locations not near window or external walls. It\'s easy to empty water container with auto cut off and has caster wheels for easy movement from room to room making it a very versatile unit. There is no complicated installation needed for this air conditioner.