How does a banks vacuum work?

Question

When you go to a bank, you can pull up in your car and send something through a tube. You hear air through it but how does it work? Like you put it in and 3 seconds later it at the clerks desk. Is it like a vacuum? Does it use fans? How does it work?

Answer 1

*Click on the following link and read the answer given by vidigod :

http://answers.yahoo.com/question/index?...