A.o. Smith 100304360 Manifold Door Assembly Low Nox

Product Description

The A.O. SMITH 100304360 is a manifold door assembly designed for natural gas water heater systems configured for Low NOx operation. This assembly serves as the front-facing combustion chamber closure, housing and aligning the burner manifold components that deliver fuel to the heat exchanger. It provides a sealed interface between the gas train and the combustion chamber, maintaining proper airflow and fuel distribution during operation. Licensed plumbers and HVAC technicians typically handle replacement of this assembly during combustion system servicing or burner compartment repairs.

This manifold door assembly is suited for residential and light commercial natural gas water heater applications where Low NOx burner configurations are required. Low NOx designs are commonly mandated in air quality management districts that impose emissions standards on water heating equipment. This part is intended for use in units requiring the OEM manifold door configuration to maintain proper combustion geometry and emissions compliance.

Key Features

• Configured for natural gas fuel supply systems
• Low NOx design supports compliance with regional emissions requirements
• OEM-style manifold door assembly for direct replacement
• Maintains combustion chamber seal for proper burner operation

Compatibility

Designed as an OEM-style replacement manifold door assembly for A.O. SMITH natural gas water heaters equipped with Low NOx burner systems.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician. Shut off the gas supply and allow the water heater to cool completely before disassembling the burner compartment. Verify all combustion chamber gaskets and seals are intact and properly seated before reassembly. Follow local mechanical codes and the manufacturer service documentation for torque and reassembly sequences.

Technical Specifications

• Fuel Type: Natural Gas
• Emission Configuration: Low NOx

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100304360