Selkirk 105307 Rv Increaser 5 to 7 Inch

Product Description

The SELKIRK 105307 is a Type B gas vent increaser fitting designed to transition a 5-inch diameter vent connector to a 7-inch diameter vent pipe. This increaser is used in residential and light commercial B-vent systems where the vent diameter must step up to match a larger vent section or appliance draft hood outlet. Licensed HVAC technicians and plumbers install this fitting as part of properly sized natural draft venting systems for gas-fired appliances including furnaces, boilers, and water heaters.

This fitting is appropriate for Type B double-wall gas vent installations where code-compliant sizing requires an increase in vent diameter along the vent connector run. It transitions from a 5-inch inlet to a 7-inch outlet, allowing the vent system to meet the capacity requirements of the connected appliance without a full vent system replacement. It is suited for indoor venting applications governed by NFPA 54 and local mechanical codes.

Key Features

• Transitions 5-inch B-vent to 7-inch B-vent in a single fitting
• Designed for Type B double-wall gas vent systems
• Supports proper draft sizing in natural-draft gas appliance installations
• OEM-style fit for standard B-vent connector assemblies

Compatibility

Designed as an OEM-style replacement or system component for Type B double-wall gas vent installations requiring a 5-inch to 7-inch diameter increase.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with NFPA 54 and applicable local mechanical codes. Shut off the gas supply and allow the appliance to cool completely before disconnecting any vent sections. Ensure all joints are secured per the manufacturer fitting instructions and that the completed vent system is inspected for proper draft before returning the appliance to service.

Technical Specifications

• Inlet Diameter: 5 inches
• Outlet Diameter: 7 inches
• Vent Type: Type B Gas Vent
• Manufacturer: SELKIRK

Standard Information

• Brand: SELKIRK
• Manufacturer Part Number: 105307