Lennox SL297NV Ultra-Low Emissions Gas Furnace

The Lennox SL297NV is a top-of-the-line ultra-low NOx gas furnace that combines innovative design with reliable comfort and eco-friendly operation.

Category: Furnace Brand: Lennox

The SL297NV features a revolutionary design that produces 65% lower NOx emissions than standard furnaces, a variable-speed blower motor for consistent and efficient air flow, and rigorous testing for ultimate reliability. It is part of the Dave Lennox Signature Collection and can be integrated with other products for the Ultimate Comfort System.

The Lennox SL297NV comes with a 10-Year Limited Warranty on covered components, with furnace heat exchangers offering either 20-Year or Lifetime Limited Warranties for added peace of mind.

About the Lennox SL297NV Ultra-Low Emissions Gas Furnace

Who this furnace is for

This Lennox gas furnace fits a defined heat-load range. Sizing isn’t done by the square footage of the home alone: a proper Manual J load calculation accounts for insulation, air sealing, window quality, basement conditioning, and ductwork. A furnace too big short-cycles and wears out faster; one too small runs flat-out on the coldest day and never quite catches up.

Why customers pick Lennox

Lennox sits at the premium end of the residential HVAC market. The brand pioneered ultra-high efficiency variable-capacity systems and has been a go-to for homeowners who value quiet operation, tighter temperature control, and longer equipment life over upfront price.

Installation notes

A furnace install involves the cabinet itself plus venting (B-vent for mid-efficiency, PVC for condensing), a condensate drain on condensing models, a properly sized gas line, a chimney liner adjustment if you’ve gone from mid- to high-efficiency, electrical, thermostat wiring, and a TSSA-permit gas safety inspection. Old equipment removal and disposal are part of the job.

Warranty and rebates

Lennox furnaces in this tier typically carry a 10-year limited parts warranty and a 20-year-to-lifetime heat exchanger warranty when registered. Enbridge Home Efficiency Rebate Plus covers high-efficiency gas furnace replacements when bundled with envelope or heat pump upgrades.

Available with professional installation by our TSSA-licensed technicians. Call (647) 558-5528 for a quote.

SEER	16
AFUE (%)	97.5
Stages of Heating	Two-Stage
Motor	Variable Speed
Blower Compartment	Insulated
Ignition	SureLight® Silicon Nitride Ignitor

No Returns or Exchanges: All products are final sale.
No Refunds: We do not offer refunds for any items.
Shipping Cost: Flat rate of $250 (in the Greater Toronto Area). Additional charges may apply in some areas.
Warranty: Manufacturer’s warranty applies, as outlined by the manufacturer.
Estimated Delivery Time: 4–9 business days.
Installation Service: Optional. You can choose whether you want installation.
- For the Greater Toronto Area, installation is provided by NorthWind HVAC.
- For areas outside the GTA, our partners will contact you to coordinate installation.