Ao Smith 100112550 Concentric Termination Kit 3x4 Inch

Product Description

The AO SMITH 100112550 is a concentric sidewall termination kit designed for direct-vent water heater and boiler systems requiring a 3 inch intake and a 4 inch exhaust. It allows a single wall penetration to serve both the intake and exhaust, reducing labor time and limiting the number of holes cut through an exterior wall. The louver-style termination functions as a built-in bird screen, blocking small animals, pests, and debris from entering the vent system. This kit accommodates wall thicknesses from 5.0 inches to 10.0 inches, making it suitable for a range of construction types. Licensed plumbers and HVAC technicians typically handle this installation.

This termination kit is intended for use with Takagi direct-vent models in residential applications. It is specifically sized for systems that require a 3 inch combustion air intake and a 4 inch exhaust outlet. The concentric design keeps both vent streams within a single penetration point through the sidewall, simplifying rough-in and finishing work. Compatible Takagi models are listed in the compatibility section below. Note that a backflow preventer is not included with this kit and must be sourced separately if required by the system or local code.

Key Features

• Single-penetration concentric design handles both intake and exhaust through one sidewall opening
• Accommodates wall thicknesses from 5.0 inches to 10.0 inches
• 3 inch intake and 4 inch exhaust configuration
• Integrated louver termination acts as a bird screen against animals, pests, and debris
• Designed for direct-vent system termination at the sidewall
• Backflow preventer not included — source separately if required

Compatibility

Designed for use with Takagi direct-vent models T-KJr2-IN, T-K4-IN, and T-D2-IN that require a 3 inch intake and a 4 inch exhaust connection.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician in accordance with local mechanical codes and the appliance manufacturer instructions. Shut off gas supply and allow the appliance to cool completely before disconnecting any vent components. Ensure the wall penetration is properly sealed against weather infiltration after the termination is set. Verify local code requirements regarding backflow prevention, as this kit does not include a backflow preventer.

Technical Specifications

• Product Type: Termination Kit
• Vent Type: Concentric
• Intake Size: 3 inches
• Exhaust Size: 4 inches
• Wall Thickness Range: 5.0 inches to 10.0 inches

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112550