Lennox 16U04 - Lennox 619598-04, Cold End Header Box Kit

 

Lennox 16U04 – Lennox 619598-04 Cold End Header Box Kit is a genuine OEM replacement component designed for select Lennox gas furnace applications. This cold end header box kit plays a critical role in the furnace heat exchanger system by properly managing flue gas flow and condensate at the cold end of the heat exchanger, ensuring safe, efficient, and reliable furnace operation.

Manufactured to exact Lennox factory specifications, the Lennox 619598-04 Cold End Header Box Kit is engineered for precise fitment and long-term durability. Using genuine OEM components helps maintain furnace efficiency, supports proper combustion performance, and reduces the risk of premature system failure caused by improper airflow or condensate handling.

This cold end header box kit is intended for professional HVAC service and repair and is commonly used during heat exchanger service, furnace repairs, or preventive maintenance. Installing an OEM Lennox header box kit helps ensure compatibility with existing furnace components and compliance with manufacturer requirements.

 

Key features and benefits:

• Genuine Lennox OEM cold end header box kit
• Designed to manage flue gases and condensate at the heat exchanger cold end
• Ensures proper airflow, efficiency, and safe furnace operation
• Manufactured to exact Lennox specifications for reliable fit and performance
• Ideal for furnace repair, service, or heat exchanger–related maintenance

 

Common applications:

• Residential and light commercial Lennox gas furnaces
• Heat exchanger service and cold end repairs
• OEM replacement during furnace maintenance

 

Part numbers:

• Lennox Part Number: 16U04
• Lennox Catalog Number: 619598-04

 

Using the Lennox 16U04 Cold End Header Box Kit helps protect system performance, extend furnace lifespan, and maintain safe, efficient heating operation when servicing compatible Lennox furnace models.