The 12 inch 3/5 Condensing Horizontal Termination Kit is designed with an aluminum inner exhaust pipe and an outer plastic intake. It is for use with Rinnai RUR series tankless hot water heaters. All RUR indoor tankless water heaters must be vented to the outdoors using concentric piping. Concentric piping allows for a single penetration through the wall for both the intake and exhaust.
The horizontal termination kit is made of impact resistant, corrosion-proof, non-flammable materials and can be installed with zero clearance to combustibles. The construction materials are easy to cut for a custom fit into you space.