It would not be the easiest thing to retrofit into a room unless you were doing an extensive remodel. From its looks, you would have to know the finished floor elevation almost exactly in order to get the wall opening in the correct location. IF the toilet is NOT a good flushing one, you do not have any other option other than to install a conventional one and abandon the vacuum system. IF any thing ever happens to the bowl, after about the first two years when the company goes out of business for lack of sales, you will have an expensive lawn ornament. Over the years many companies, i.e., American Standard, have produced "venting" toilets and NONE have ever lasted more than few years.