A.o. Smith 100322375 Concentric Vent Kit Sidewall 21 in

Product Description

The A.O. SMITH 100322375 is a 21-inch concentric vent kit designed for sidewall termination on direct-vent water heaters. Concentric vent systems route the combustion air intake and exhaust flue through a single wall penetration using a pipe-within-a-pipe configuration, simplifying installation and reducing the number of holes required in the building envelope. This kit is installed by licensed plumbers and HVAC technicians during new water heater installations or when replacing an existing venting assembly. The 21-inch length suits standard wall thickness applications in residential construction.

This vent kit is used in sidewall direct-vent water heater applications where the appliance draws combustion air from outside and exhausts flue gases through the same wall penetration. It is suited for residential installations where roof penetration is not practical or code-permitted. The concentric design keeps the outer intake pipe cool to the touch and maintains a clean, single-collar exterior wall termination. Install locations must comply with local mechanical codes governing clearances from windows, doors, gas meters, and electrical openings.

Key Features

• Concentric pipe-within-a-pipe design combines intake and exhaust in one wall penetration
• 21-inch length accommodates standard residential wall assemblies
• Sidewall termination eliminates the need for roof penetration
• Designed for direct-vent water heater venting systems
• Single wall opening reduces labor and sealing requirements

Compatibility

Designed as an OEM-style replacement concentric vent kit for A.O. SMITH direct-vent water heaters requiring sidewall termination venting.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician in accordance with local mechanical codes and the water heater manufacturer instructions. Shut off the water heater and disconnect power or gas supply before servicing or replacing any venting components. Verify required clearances from building openings, grade level, and ignition sources per local code before selecting the termination location. Do not modify the vent kit components or substitute sections not approved for use with the appliance.

Technical Specifications

• Product Type: Vent Kit
• Vent Style: Concentric
• Termination Type: Sidewall
• Length: 21 inches

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100322375