No. A respirator and ventilator are alike, but different. A ventilator is what they out people on either life support or during surgery. A respirator is used to help breathing not do it for you! (:
A Ventilator: A ventilator is a machine which mechanically assists patients in the exchange of oxygen and carbon dioxide in and out of the body. It is similar to life support, but has a different job...
If Fall is the same thing as Summer, and there are four seasons, then that would correspond to 7 days of the week, meaning it would actually be closer to Saturday.
Yes, "how do you do?" is a more formal way of saying "how are you?" It is more or less archaic. However, "How do you do" is never responded to literally, by telling the greeter how you are.