The Lennox 16U05 (part number 619598-05) Cold End Header Box Kit is a genuine OEM replacement component designed for use in select Lennox high-efficiency gas furnaces. The cold end header box, also commonly referred to as a collector box, plays a critical role in managing condensate produced during the combustion process and ensuring proper airflow through the secondary heat exchanger. Replacing a worn, cracked, or leaking header box with the correct Lennox OEM kit helps restore furnace efficiency, prevent water damage, and maintain safe, reliable operation.

This kit is manufactured to Lennox factory specifications, ensuring precise fitment, long-term durability, and full compatibility with approved Lennox furnace models. It is intended for professional HVAC service and repair applications where maintaining OEM performance and reliability is essential.

 

Specifications:

Manufacturer: Lennox
Part number: 619598-05
Catalog number: 16U05
Product type: Cold end header box / collector box kit
Function: Condensate collection and airflow management at the cold end of the furnace heat exchanger
Application: Select Lennox high-efficiency gas furnaces
OEM status: Genuine Lennox factory replacement part

 

Compatibility:

This Cold End Header Box Kit is designed for specific Lennox furnace models that require part number 619598-05. Always verify model and serial number compatibility before ordering to ensure proper fit and operation.