A turbofan jet engine includes an outer fan duct, an inner fan duct, fluid-conveying ancillaries located outside the outer fan duct, fluid-conveying ancillaries located inside the inner fan duct. A gate electrode is adjacent to but insulated from the well region, and a source region of the first conductivity type is in the well region. The tortuous path creates quieter air flow through the vacuum housing. The compositions, which preferably take the form of oil-in-water emulsions, provide both immediate and long-term control of oily andor shiny skin.