Jali Walls

"Jali" are perforated walls used in the regulation of heat, wind and light. These walls contain holes (numerous windows) in different ornamented patterns to let air flow through them. When air flows through small openings, their velocity increases, thereby reducing the inner temperature. Also when the air is compressed and released, it becomes cool. (Bernoulli's Principle) They also cut out the glaring light and create a diffused, uniform and pleasant lighting to the interiors.

Usually in humid climate like Tamilnadu, the Jali openings are bigger to facilitate ventilation, whereas in dry climates, the openings are small to cut out the scorching heat.

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Pictures from : Darasuram Temple, Tamilnadu

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