Amana-Goodman 4021308S Heat Exchanger Sub Assembly 3-Cell 17.5"

The Amana-Goodman 4021308S is a genuine OEM service replacement heat exchanger sub assembly designed for Goodman, Amana, and related brand gas furnaces. This 3-cell, 17.5" heat exchanger sub assembly restores factory-specified heating performance and operational safety in compatible 80% AFUE upflow and horizontal gas furnaces.

The heat exchanger is the critical thermal boundary in a gas furnace — combustion gases pass through the sealed exchanger cells, transferring heat to the circulated indoor airstream without mixing combustion byproducts with breathable air. A cracked or degraded heat exchanger can allow carbon monoxide intrusion and must be replaced promptly. Installing a genuine OEM replacement like the 4021308S ensures a precise fit and restores proper combustion containment and heat transfer efficiency.

Key Features:

• Genuine OEM Part — manufactured by Goodman/Amana for exact-fit replacement
• 3-Cell Configuration — engineered for mid-range BTU output furnace models
• 17.5" Cabinet Width — designed for 17.5" wide furnace cabinet models (M9–M12 model designations)
• Aluminized Steel Construction — provides corrosion resistance and durability through repeated thermal cycling
• Restores Safety and Efficiency — eliminates risks associated with cracked or burned-through heat exchanger cells
• Direct Replacement — no field modifications required for compatible furnace models

This part is used as a service replacement component in Goodman, Amana, Daikin, Janitrol, and other related brand furnaces equipped with a 17.5" cabinet. Always verify your furnace model number before ordering to confirm compatibility.