Qualities of Good Furnace for Gul Preparation
1. There should be regular intake of fresh air.
2. A feeding mouth should be of suitable dimension.
3. There should be a passage for the removal of smoke.
4. There should be an arrangement of receive ash at the bottom of furnace.
5. There should be an ample evaporating surface for the pan.
6. It should save fuel.
7.It will allow proper burning of the fuel and the complete utilization of heat that is produced in the furnace.