Let's find some common ground on Propex terminology.
Pipes: We call the smaller (22mm in the HS2000 and HS2211, 26mm in the HS2800) intake and exhaust in the combustion circuit pipes. When you're speaking with our tech support, we'll be referring to pipes rather than ducts, tubes, etc. These pipes are NOT to be shorter than 1 meter (about 40 inches) whatsoever.
Ducts/Ducting: The fresh/heated cabin air is transferred by larger (60mm in the HS2000 and HS2211, 76mm in the HS2800) corrugated ducting. The heater takes ambient temperature cabin air, runs it across the heat exchanger within the unit and then delivers the heated air back into the cabin via ducts.
Tube/Tubing: We speak of the propane delivery line from the regulator as tubing. Why tubing? In engineering, when the outside diameter of a delivery 'tube' is of specific importance, the specification calls for tubing as opposed to pipe or channel. In the case of Propex, the propane fitting at the heater is a 1/4" compression fitting, requiring tubing that has an exact 1/4" outside diameter.
Pipes:
Ducts/Ducting:
Tube/Tubing:
