You wrote:

>> How long would a 2-3/4" diameter port be for Studio 2pi?

You can use a 5 3/4" long duct that's 2 3/4" diameter with good results. The problem now will be finding a 2 3/4" diameter tube. You may want to go up to 3" port material, which actually has 2.88" inside diameter since wall thickness is 0.060". You can find this port material at www.PaperMart.com. If you choose the 3" diameter duct (2.88" I.D.), you'll want it to be 6 1/2" long.

Take care!

Wayne