Final answer:
The exhaust fan in a computer case removes hot air and helps maintain a cool temperature inside the case.
Step-by-step explanation:
The purpose of the exhaust fan in a computer case is to remove hot air from the case. When a computer is running, it generates heat. If this heat is not properly removed, it can cause the components inside the computer to overheat and malfunction. The exhaust fan helps to maintain a cool temperature inside the computer case by expelling the hot air and allowing fresh, cooler air to come in.