A study of the air flow and consumption of an air jet loom weaving cotton fabric showed that more than 80 percent of he total air consumption occurred only through the main and relay nozzles. This result indicated that the energy efficiency of this loom largely depended on the design and jet timings of these nozzles. The study, which involved calculations that required specific assumptions, showed that approximately 90 kilograms of standard atmospheric air was necessary to propel or insert 1.0 kilogram of 16.8 tex filling yarn across a 127 centimeter loom that was weaving a print cloth construction at 500 picks per minute. The study also indicated that weaving a wide fabric on a wide loom would be more economical than weaving a narrow fabric on a narrow loom, such as the one used in these experiments. 8 refs.