The 21 inch Universal Non-Condensing Horizontal Termination Kit is designed with an aluminum inner exhaust pipe and an outer plastic intake. It is for use with Rinnai HE+ / Luxury Series and HE / Value Series tankless hot water heaters. All 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.