Airpap never got a response worth reading. The 1617 is the designation for the American model, 115v. I believe a similar model with a different number designation is available in Europe. They are not exactly the same to my uderstanding, and the European model is metric. Anyone recall that euro model number, something with a 20 in it I think.
If I were Airpap, reading the comments, I'd be out of here. Some entries read as quite hostile, or at least demeaning. Let's mind our manners.