The Lennox 54M61 Air Intake Coupling Assembly (LB-100674A) is a genuine OEM combustion air intake component designed for select Lennox gas furnaces. This air intake coupling ensures a secure and airtight connection between the combustion air piping and the furnace intake, supporting proper airflow, stable combustion, and efficient furnace operation. Manufactured to Lennox factory specifications, this part helps maintain system reliability and protects against air leaks that can negatively impact performance or safety.

This OEM Lennox air intake coupling assembly is commonly replaced when the original component becomes cracked, brittle, or damaged due to heat exposure or aging. Using a genuine Lennox replacement ensures correct fitment, long service life, and compatibility with approved Lennox furnace models. Ideal for HVAC contractors and homeowners performing furnace maintenance or repairs.

 

Product Overview:

The Lennox 54M61 / LB-100674A air intake coupling assembly connects the incoming combustion air supply to the furnace intake port. It plays a critical role in sealed combustion systems by maintaining proper airflow and preventing unconditioned air leakage. Designed for durability and precision fit, it meets Lennox OEM quality standards.

 

Specifications:

Manufacturer: Lennox
Part Number: LB-100674A
Catalog Number: 54M61
Product Type: Air Intake Coupling Assembly
Application: Combustion air intake connection for Lennox gas furnaces
OEM: Yes