The turbine exhaust ducting and turbine exhaust hoods were of welded sheet metal construction. Acoustic treatment in the intake and exhaust ducting minimizes turbomachinery noise. Large, low-speed air ducting cuts the ventilation noise. The gas left the turbine through the exhaust ducting. These losses are quantified by compressor and turbine efficiencies and ducting pressure losses. It can be scooped off completely by a diverter or internal bleed ducting. Measures to modify the cooling ducting were of little avail. These are often fabricated from spun metal or flexible aluminum ducting. Air conditioning ducting and equipment can be expensive and demand a lot of ceiling space. The stationary compressor is ducting with increasing flow-area where energy transformation takes place. An interconnected air dam also closed off the nose ducting for streamlining. The dynamos were placed on the platform deck between the ducting for the boilers. Kinks in flexible ducting must be avoided. Another way of eliminating odor is by installing an ozone generator in the extraction ducting. E-skip is unrelated to tropospheric ducting.