I looked at the installation videos and set of instructions that are on the Nature's Head web site and discovered that the 830 might not have enough room for an install. The width I have available is 19" and the unit is 17.4" wide. The literature shows that there is 2" needed for the sideward movement to unmount the toilet for it to be emptied. I need to do some more research. One concern was the location of the fan mounted on the side of the toilet getting wet. Many put the fan on the other end of the vent so that it draws air from a distance. Air Head fits in a smaller space but I am not as impressed with the design features. I'll keep looking, not in a rush to swap this out yet. I think I almost have my DW convinced, however, it would good for her to experience the event before we purchase one. That would sell her for sure.