The sound attenuator flexible duct has a 2" inside diameter and 3.5" outside diameter insulated to R3.3 with 1 vapor barrier. It comes with Twist-Fit connectors on each end.
The Unico System uses less than one-third of the space in the built environment than a traditional system. It can deliver up to 9 tons of air conditioning in the same space as a 3-ton traditional unit.