More boring stuff. One reason I am posting this here is I have found very little detail on DIY install of a concentric vent system. The instructions from the manufacturer are very vague and not much help. I called the manufacturer and they would not address any of my questions because I was not an HVAC guy. I realize the seriousness and pitfalls associated with a self install and I will be getting my system inspected by the county and the propane provider to ensure a safe system. I have recently installed and successfully passed inspection for a new natural gas line in my home for a gas range.
Next few shots are of the pipes going in between the heater and the concentric adapter box.......
Dry fit of plumbing for outside air intake:
Connecting hot gas vent with the required hight temp sealant (protection from -75 to +500 deg F)