A kitchen exhaust fan that grinds, wobbles, or keeps tripping the breaker is usually telling you something a degreasing pass cannot fix. In Connecticut restaurants we see the same pattern again and again: the hood gets cleaned, the fan runs for a week, then the noise comes back. The culprit is often a worn bearing or a motor that has been working against grease-stiffened parts for years. Knowing when to stop cleaning and start replacing components saves you a shutdown, a fire