The Lennox 78W81 is an OEM replacement heat exchanger engineered to restore safe and efficient heating performance in compatible Lennox furnace systems. Designed to exact factory specifications, this heat exchanger ensures proper combustion gas containment and optimal thermal transfer — keeping conditioned air clean and your system running at peak efficiency.
Why Replace Your Heat Exchanger?
A cracked or failing heat exchanger is one of the most serious issues in any forced-air heating system. It can allow combustion byproducts — including carbon monoxide — to mix with circulated air, creating a significant safety hazard. Replacing a worn heat exchanger with a genuine Lennox OEM part restores the integrity of the heat transfer process and helps protect building occupants.
Key Features
- Genuine Lennox OEM replacement part (SKU: 78W81)
- Engineered to factory specifications for precise fit and function
- Maintains proper combustion gas separation from supply air
- Supports optimal thermal efficiency in compatible Lennox furnace models
- Durable construction for long-lasting, reliable performance
- Direct replacement — no modification required
Application
This heat exchanger is a direct OEM replacement designed for use in compatible Lennox furnace systems. Always verify compatibility with your specific furnace model number before installation.
Installation Notes
Heat exchanger replacement should be performed by a qualified HVAC technician. After installation, inspect all connections and perform a combustion analysis to confirm safe and proper system operation.
