Our same day surgery unit has 10 ORs and three flash autoclaves in substerile rooms between sets of ORs. One flash autoclave is for rooms 1 through 4, another for rooms 5 through 8, and the third for rooms 9 and 10. When the unit opened in 1982, this configuration worked. Most of the cases were lumps-and-bumps and other minor procedures, and the instrument inventory matched the unit's needs quite well.