Lennox Furnaces

Lennox® furnaces are some of the most efficient and quietest heating systems you can buy*. They’re engineered for perfect warmth and savings.

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SL297NV VARIABLE-SPEED, ULTRA-LOW EMISSIONS GAS FURNACE
First-in-class, lowest emission furnace on the market

All Around Comfort

The SL297NV ultra-low NOx gas furnace with our revolutionary design provides reliable comfort, while producing 65% lower NOx emissions than standard low NOx furnaces. So, while you’re staying cozy and warm, you’re also helping to protect the environment.


Consistent Temperatures

A variable-speed blower motor allows for constant and efficient adjustments of air flow speed and gently disperses even heat throughout your home. It also prevents loud blasts of air that can occur when a single-speed system starts up, providing quiet operation for enhanced comfort.


Peace of Mind

The SL297NV has undergone rigorous testing in our research lab to ensure the highest level of reliability. So, you can relax and enjoy the warmth and trouble-free operation.