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I am looking for a central air set-up (A/C) that has round exhaust pieces in the ceiling. I know I have seen the unit on This Old House.. Any idea which brand makes this?
It sounds like you are looking for a 'high pressure' system that utilizes small openings with high velocity for discharge air. There are actually (or were at one time) several manufacturers that had this available.
Is there some particular reason you are contemplating using this type of system?
All the best, Irishmist
Here's one http://www.spacepak.com/