Furnace System GuideDucane publishes a product page for its 97G2VK gas furnace. This entry records what that page states about the furnace's efficiency, staging, blower, heat exchanger, and registered warranty coverage.
97G2VK efficiency, staging, and blower
Ducane's product page states the 97G2VK carries a 97 percent AFUE efficiency rating and is ENERGY STAR certified. The page describes two-stage operation that adjusts heat output based on indoor and outdoor temperatures to balance comfort and energy use.
Ducane lists a variable-speed blower motor that starts slowly and then quietly accelerates to hold temperature and humidity steady. The page presents the two-stage and variable-speed pairing as its efficiency and comfort story.
Heat exchanger and warranty as documented
Ducane's 97G2VK page states the furnace uses an aluminized-steel heat exchanger that is crimped, not welded, which Ducane frames as a durability and safety feature during burner ignition.
The page states a limited lifetime warranty on the heat exchanger with registration and a 10-year limited warranty on parts. The heat exchanger construction and warranty terms are recorded as written on the product page.