Floor framing is generally very straightforward. When you are hell-bent on having zero ductwork or pipes on the ceiling of your basement, it is anything but. Access to the joist bays from the mechanical room has to be very carefully thought out to ensure that supply and return ducts have a path through the labyrinth to the necessary locations. Add in a ventilation system with 32 supply/return tubes and you have a real puzzle on your hands. Happily, I have come up with a plan which should satisfy all the objectives.