According to position of furnace.
{"Image DocumentName": "According to position of furnace.", "Image ImageDescription": "(i) Internally fired (ii) Externally fired. In internally fired boilers the grate combustion chamber are enclosed within the boiler shell. whereas in case of extremely fired boilers and furnace and grate are separated from the boiler shell. According to the position of principle axis. (i) Vertical (ii) Horizontal (iii) Inclined.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}