Reznor Duct Furnaces

Reznor gas duct furnaces provide time-tested, contractor-approved heating solutions for commercial and industrial HVAC systems. Designed to integrate seamlessly into ducted heating, cooling, and makeup air applications, Reznor duct furnaces deliver dependable performance, flexible configurations, and long-term durability for a wide range of building types.

This collection includes indoor and outdoor gas-fired duct furnaces available in natural gas or propane, with heating capacities ranging from 75,000 to 800,000 BTUH and airflow capabilities from approximately 610 to 14,800 CFM. Reznor duct furnaces are commonly used in warehouses, manufacturing facilities, gyms, schools, distribution centers, and large commercial spaces where centralized ducted heat is required.

Reznor offers multiple duct furnace designs to match specific application needs, including energy-efficient power-vented models, separated combustion furnaces for dirty or negative-pressure environments, gravity-vented indoor units, rooftop power-vented furnaces, and high-capacity dual duct configurations. Many models feature Thermocore® aluminized steel heat exchangers, stainless steel burner options, and advanced combustion designs that help improve efficiency and extend equipment life.

Key benefits across the lineup include 80% thermal efficiency, flexible temperature rise ranges, compatibility with makeup air and recirculation systems, and a wide range of control options such as single-stage, two-stage, and electronic modulation. Contractor-friendly designs allow for indoor or outdoor installation, horizontal or vertical airflow configurations, and easy integration with remote blowers and existing ductwork.

Built on more than 130 years of heating innovation, Reznor gas duct furnaces are CSA certified for use in the U.S. and Canada and engineered to meet the demands of high-capacity, continuous-operation environments. Explore the full Reznor gas duct furnace collection to find a reliable, efficient heating solution tailored to your building and system requirements.