[mockingbird812]

Slow going on the plumbing for the propane heater. 1st shot is what the connections will look like above the concentric vent adapter box which passes through the attic and up to the the intake and exahaust caps that will be placed above the roof line. The top cap is the exhaust vent for the hot gases. The cap below it is the fresh air intake for an external source of combustion air. The system is called 'concentric' because the fresh air intake pipe is located external to the double wall (type B) hot exhaust air vent which runs up the center of the fresh air pipe. One advantage of this set up is that it requres only one hole through the roof. Next shot is the adapter box attached to the ceiling.