Thanks for the link. Hadn't seen that part about inside corners. However, it is an outside corner clearance I'm trying to determine. One of the notes on page 59 state: For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
Outside corner clearance is not specified by ANSI Z223.1/NFPA 54 and I certainly can't find it in the manufacturer's installation instructions. Seems like outside corner clearance would have been mentioned in that same section that inside corners was called if there was a manufacturer's requirement.
I don't find any reference to outside corner clearance in Seattle's fuel gas code (but I may just not have found it).
Wondering if this means there isn't a required clearance?
Thanks