The Fully Ducted Extreme Series units can be positioned up to 25 ducted feet from the cellar, creating a noise-free cellar environment. Fully ducted installation provides many installation options, allowing you to not only put the unit in more remote areas of the home but to also have full control of where the exhaust air vents to. This series features an advanced liquid temperature controller with a remote LED display (which can be placed up to 300 line feet from the unit) and electronic thermostat. Maintain 55°F in a cellars up to 800 cu. Ft. (3500tiR), 1250 cu. Ft. (5000tiR), or 2000 cu. Ft. (8000tiR) in size.