wow thanks for the help.. i im gonna try it.the room is gonna be 15 x 20. if the ducting was below the frost line it probably wouldnt show and its gonna be concrete block and heavily insulated plus ac and some of the vents are gonna be ran underground 3 to 5 ft.to cool them (in and out of the room)then into a regular house vent. plus the ceiling of this contrapition is gonna be 3 feet underground..thanks again.. i learned alot from this thread .