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The paper discusses the effect of various design parameters of wind catchers on availability of air motion indoors. An increase in the catcher size up to about 1.5 times the size of roof opening produces an increase in average indoor wind speeds. Further increase in catcher size does not provide additional benefit. The depth of the projection on the roof of the catcher is twt crucial, but the location of air-supply openings is important. Air motion in the normal working zone is maximum when the duct conveying wind indoors terminates near the ceiling. An increase in the length of the duct causes little reduction in availability of air motion indoors. A supply opening located in the bottom of the duct performs better than the one located in its side wall.

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