Natural draught

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the draught produced by the atmosphere flowing, by its own weight, into a chimney wherein the air is rarefied by heat.

See also: Draught

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Natural draught cooling towers would not work in this region because outside ambient temperatures are not cool enough, air density variance is minimal between certain heights and there is not enough natural draught in the air (particularly in hot weather) for this type of tower to efficiently work in the GCC.
Each installation features rows of natural draught bar burners arranged beneath the base of each tank.
For example, he did the design audit for the Kendal Natural Draught Dry Cooling Tower in South Africa, the largest indirect system in the world--six towers, each 165 meters high, with a base diameter of 163 meters.
Natural draught cooling is maximised and power saved.

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