A study of the air flow and consumption of an air-jet weaving machine weaving a particular cotton fabric has shown that more than 80% of the total air consumption of the machine occurred through the main and relay nozzles only, indicating that the energy efficiency of such a machine is largely dependent on the design and jet-timings of these nozzles. The study, which involved certain computations made with some reasonable assumptions, showed that approximately 90 kg of standard atmospheric air was required to propel/insert just 1.0 kg of 16.8-tex filling yarn across a 127-cm wide machine weaving a print-cloth construction at 500 ppm. The study also indicated that weaving a wide fabric on a wide machine would be more economical than weaving a relatively narrow-width fabric on a narrow-width machine such as used in this study.