Selkirk 105308 Rv Increaser 5 to 8 Inch Vent Fitting

Product Description

The SELKIRK 105308 is a Type RV increaser fitting designed to transition a 5-inch vent pipe up to an 8-inch vent pipe diameter. This type of increaser is used in single-wall metal vent systems to accommodate diameter changes within a venting assembly. Licensed HVAC technicians and plumbers install these fittings when connecting appliances or vent sections that require a step-up in pipe size. The 5RV-I8 designation confirms the inlet and outlet dimensions: 5 inches inlet, 8 inches outlet.

This increaser fitting is suited for residential and light commercial venting applications where a Type RV single-wall vent system requires a diameter transition. Common install scenarios include connecting a smaller-diameter appliance flue collar to a larger-diameter main vent trunk or chimney connector. It is appropriate for gas appliance venting within the system type and diameter range specified by the fitting designation.

Key Features

• Transitions vent pipe from 5 inches to 8 inches in a single fitting
• Type RV single-wall vent construction
• Designed for secure, leak-resistant connection within a vent assembly
• Part number 5RV-I8 confirms inlet and outlet sizing for fast field identification

Compatibility

Designed as an OEM-style replacement or upgrade fitting for Type RV single-wall gas vent systems with a 5-inch inlet and 8-inch outlet requirement.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable fuel gas codes such as the IFGC. Shut off the gas supply and allow the appliance and vent system to cool completely before servicing any vent components. Secure all joints per local code requirements and inspect for proper alignment and support after assembly. Do not use this fitting outside its rated vent system type or diameter range.

Technical Specifications

• Inlet Diameter: 5 inches
• Outlet Diameter: 8 inches
• Vent System Type: Type RV Single-Wall
• Fitting Type: Increaser

Standard Information

• Brand: SELKIRK
• Manufacturer Part Number: 105308