Before revision: Pneumatic barriers are also known as air curtains.
After revision: An other application of a pneumatic barrier is to decrease the salt-water exchange in navigation locks and prevent salt intrusion in rivers Abraham, G. Van der Burgh, P. De Vos, P. (1973) Pneumatic barriers to reduce salt intrusion through locks, Rijkswaterstaat Communications 17, URL Pneumatic barriers are also known as air curtains.