<P>A ventilation system may be designed more or less according the following procedure:
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<P>1. Calculate heat or cooling load, including sensible and latent heat
<P>2. Calculate necessary air shifts according the number of occupants and their activity or any other special process in the rooms
<P>3. Calculate air supply temperature
<P>4. Calculate circulated mass of air
<P>5. Calculate temperature loss in ducts
<P>6. Calculate the outputs of components - heaters, coolers, washers, humidifiers
<P>7. Calculate boiler or heater size
<P>8. Design and calculate the duct system
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<P>There's no way around it... all my calculations result in inconveniently man-sized ducts. I guess the solution is... lasers. And little robots. In fact that sounds totally awesome.