Why are vibration isolators used in fan systems?

Vibration isolators are employed in fan systems primarily to help absorb mechanical airflow imbalances. When a fan operates, it can generate vibrations due to factors such as the rotation of the blades, motor operation, or imbalances in the system. These vibrations can lead to noise and potential damage to the fan itself and the surrounding structures if not managed properly.

By incorporating vibration isolators, which can be made from materials like rubber or other flexible components, the system can dampen these vibrations. This results in smoother operation and reduced transmission of noise and vibrations to adjacent structures or equipment. Improved stability and reduced wear on mechanical components also contribute to the longevity and efficiency of the fan system.

The other options do not adequately capture the primary purpose of vibration isolators. Increasing airflow pertains to the fan's output performance and is not the function of isolators. Enhancing fan speed control is related to the motor's capabilities or speed modulation techniques rather than isolating vibrations. Adjusting for duct size addresses the design aspects of the ventilation system rather than the mitigation of operational vibrations.