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Ultra-Low NOx Gas Furnaces<

Better with every breath.

NOx causes respiratory problems — such as wheezing, coughing, colds, bronchitis and worsened asthma — and is harmful for vegetation.

California lowered NOx emission limits from 40ng/J to 14ng/J for all natural-gas-fired, fan-type residential central furnaces within certain parts of the state.

An installation uncompliant with these emission standards is liable for a fine up to $450.

Learn more about South Coast Air Quality Management District (SCAQMD) emissions limits.
Learn more about San Joaquin Valley Air Pollution Control District (SJVAPCD) emissions limits. Learn more about the 2024 Bay Area Air Quality Management District future emission limits.

Counties and areas where 90% condensing and 80% non-condensing gas furnaces must meet the 14 ng/J NOx limit requirement. Counties and areas where 90% condensing and 80% non-condensing gas furnaces must meet the 40 ng/J NOx limit requirement.

Why choose a Lennox Ultra-Low NOx solution.

Lennox is the first manufacturer with a full line of ultra-low emissions furnaces.

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Lowest emissions

Lennox Ultra-Low NOx furnaces produce 65% less NOx emissions than a low NOx furnace.

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Lower Bills

They are more cost effective, creating projected 25% heating cost savings over an average year.

Lennox Solutions

Products that offer ultra-low emissions

SL280NV Variable-Speed, Ultra-Low Emissions Gas Furnace

SL280NV Variable-Speed, Ultra-Low Emissions Gas Furnace

First-in-class, lowest emission furnace on the market

Rating:

Efficiency Rating (AFUE):

up to 80.0

Price Guide:

$$$

Availability:

SL297NV Variable-Speed, Ultra-Low Emissions Gas Furnace

SL297NV Variable-Speed, Ultra-Low Emissions Gas Furnace

First-in-class, lowest emission furnace on the market

Rating:

Efficiency Rating (AFUE):

up to 97.5

ENERGY STAR^® Qualified:

Price Guide:

$$$

Availability:

EL195NE Ultra-Low Emissions Gas Furnace

EL195NE Ultra-Low Emissions Gas Furnace

First-in-class, lowest emission furnace on the market

Rating:

Efficiency Rating (AFUE):

up to 95.0

ENERGY STAR^® Qualified:

Price Guide:

$$

Availability:

EL180NE Ultra-Low Emissions Gas Furnace

EL180NE Ultra-Low Emissions Gas Furnace

First in class, lowest emission furnace on the market

Rating:

Efficiency Rating (AFUE):

up to 80.0

Price Guide:

$$

Recognized for leading the way.

Year after year, leading institutions choose to award Lennox for its innovative initiatives in the heating and cooling industry which helps homeowners define what perfect air means to them. Below you'll find a few of the recognitions this product has received.