Caryaire 1 Way Cassette Unit is Suitable for Commercial Applications such as Offices, Shops, Hotel Balconies, Show Rooms or any Place where the unit is required to be installed where airflow is required in one direction only. This can be installed easily above any Ceiling because of Slim Design. The Unit has a Drain Pump similar to standard 4 Way Cassette Unit to remove condensation from the unit while in operation.