Just completed this job using half round textile ducting.
It's a hospitality area for a football stadium (football as in a ball you kick with your foot rather than hold and run with!) ;-p
There was a fight on between the football players and the rugby players, one strip is dark blue, the other is light blue. They managed to make a decision on the colour of the airsock, but weren't so successful with the cladding of the stadium!