is 336.49 KB, has a resolution of 600x600 pixels and was uploaded on January 16, 2020 @ 9:32 am by user: maxmarin. It is filed under the tags: annual fuel utilization efficiency, electronic component, ventilation, heat, efficiency. Click the blue button at the top to freely download: Furnace Duct Annual Fuel Utilization Efficiency Heater Natural Gas png.