The air curtain is installed inside the doorway, and air blows down toward the floor, sometimes at a slight angle outward. Jupiterimages/Getty Images There are two ways to use an air curtain.
Psychotherapy is the first form of treatment for depression or anxiety and involves a variety of treatment techniques. During psychotherapy, the person experiencing depression or anxiety speaks with a licensed psychologist or therapist who helps him or her to identify and work on the causative factors.
One of the earliest forms of depression specific treatment was psychoanalysis, a method developed by Sigmund Freud in the late 1800's. In the 1930's electroconvulsive therapy was utilized, but again, there was not always a distinction made between persistent mental disorders.