What is a Sterling TD Series duct furnace?

Hello, thank you for reaching out. A Sterling TD Series duct furnace is a gas-fired heating unit that is designed to heat the air in existing HVAC systems and ducted air applications. These duct furnaces use a tubular heat exchanger and Sterling's In-Shot burner technology to provide its reliable heating for commercial and industrial spaces. The TD Series duct furnaces are available in natural gas and propane configurations and either aluminized steel or stainless steel heat exchangers. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.