Q: What is the difference between single hole relay nozzle and multi hole relay nozzle?

The single hole nozzles need to be adjusted by hand, and are recommended in case of dusty environment or low air quality. More space required, and the distance between nozzles may vary.
The multi hole nozzles have very stable blowing angle. The design allows a more efficient air stream, giving up to 15% higher insertion speed for the same air consumption. Multi hole nozzle requires less space between the warp yarns, which prevents nozzle marks on the fabric.