What venting options are available for Sterling TD duct furnaces?

Hello, thank you for reaching out. Sterling TD Series duct furnaces are power vented and ETL certified for Category III venting requirements. These duct furnaces support vertical or horizontal venting using single-wall  or double-wall venting materials. Which this flexibility can make it easier to plan an installation around existing building conditions. A qualified installer should select the correct venting materials and configuration for the specific furnace. 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.