In the case of BORA Professional and BORA Classic, using different fan modules and the BORA Ecotube duct system, exhaust ducting measuring at least 16 metres can be realised, or 6 metres in the case of X Pure, Pure and Basic. Bends reduce the potential duct length.  For BORA X Pure, BORA Pure and BORA Basic, the exhaust channel should not exceed the maximum length of 6 metres. It generally applies that bends can be replaced in certain circumstances and so the duct length can be shortened.  Your local BORA partner is available to help you with your customised planning requirements.