Where should an inline fan be mounted?
Inline fans should be installed as far away from the hood as possible. We advise that they not be mounted on a ceiling, as this can cause excessive noise and vibration. Instead, inline fans should be supported by a load bearing wall to reduce noise and vibration. Vibration isolators included with the fan should be used. Inline fan Installation manual. My inline fan makes a loud squealing or metal on metal scraping sound.