A method, system, and computer program for managing network connectivity between a plurality of nodes and a network resource. The system or device may determine to place the voice call to the original number, or to a different number, based on an input, which is based on the visual interface, from a user who may have, or may not have, made the request. A separator, such as a centrifugal separation device, comprises a wastewater inlet, an organic phase outlet for discharging low density liquid and solids and an aqueous phase outlet for discharging water and possibly other high density liquids and solids. The apparatus also includes an exhaust fan disposed near the fixing unit, for exhausting air from within the image forming apparatus.