These extractor hoods have an air outlet both at the top and the bottom. During installation you can configure the air outlet according to your requirements, simply by turning the internal motor unit through 90 degrees. The classic top outlet is recommended for both operation in recycling mode and duct-out mode with an exposed flue. With the innovative rear outlet, the system can operate in duct-out mode without the need for an exposed flue. In this case, the extractor hood must be connected to a fume extraction duct inside the wall on which the hood is to be installed.