I'm currently designing a domestic water service entry in a building where the designated area by the architect for the backflow preventer will see a lot of traffic (police facility vehicle service bay.) I'll be specifying a horizontally mounted RPZ and considered the possibility of installing the backflow preventer higher than usual (~7') to clear up the traffic space. Is there anywhere in the IPC that dictates the maximum allowable backflow preventer mounting height? If 7' won't work, I'll just resort to asking the architect for a Janitor's closet somewhere.