A exhaust fan curb adapter is a device used to provide a secure connection between an exhaust fan and a roof curb. It is designed to provide a tight seal that prevents air leakage, and is typically made of metal or plastic. The adapter is designed to fit snugly onto the fan, and is secured to the roof curb with screws or bolts. The adapter is essential for proper installation of an exhaust fan, as it helps to ensure that the fan is properly sealed and will not allow air to escape. Additionally, the adapter helps to ensure that the fan is properly balanced and will not cause vibration or noise when in operation. Installing an exhaust fan curb adapter is a relatively simple process, and can be done in a matter of minutes. However, it is important to make sure that the adapter is properly installed and secured to the roof curb in order to ensure a safe and secure connection.