Stack Height/Limits of Kiln unit
Kiln Capacity	Recommended Stack Height for Optimum Dispersion of Sulphur Dioxide
Less than 15,000 bricks are day (less than 15 ft trench width)	Minimum stack height of 22 m, or, incluced draught fan operating with minimum draught of 50 mm Water Gauge With 12 m stack height.
15,000-30,000 bricks per day (more Than 15-22 ft trench width)	Minimum stack height of 27 m with gravitational settling chamber
	or
	Induced draught fan operating with minimum draught of 50 mm Water Gauge With 15 m stack height.
More than 30,000 bricks per day (More than 22 ft trench width)	Minimum stack height of 30 m with gravitational setting chamber
	or
	Induced draught fan operating with minimum draught of 50 mm water gauge with 17 m stack height.