the machine specs can be found on Fadals site where they have all of the maint.manuals for download. If you don't have an extended z option I think the height is 82 inches (don't quote me on that). You need to drop the head all the way down, and if you have to get really low you can take off the z axis servo motor with 4 bolts, undo the bolts holding on the "snake track" thats just 6 or so allen head bolts, and drop that down too. That should get you through the door.