- Metal Outer Vent For Intake
- Aluminum Inner Vent For Exhaust
- GSA Approved
- Vertical Termination Through Roof
- Professional Installation Recommended
Details: Rinnai's unique Nubbin concentric venting system provides maximum performance, safety, and ease of installation. Compatible with all indoor Rinnai water heater models, except the 98 series which utilizes separate intake and exhaust venting.
Package Dimensions: 39.0 x 8.6 x 8.0 inches