How does a Standard Air Knife work?

Compressed air flows through the inlet (1) into a plenum chamber. It is then choked through a thin nozzle (2) which runs along the entire length of the Standard Air Knife. This primary airflow follows the Coanda profile (3), which turns it 90° and directs the flow along the front of the unit. The primary flow immediately starts to entrain ambient air (4), giving a gain factor of 30:1 at a distance of 152 mm.