Routine
Hood Fan Making Noise or Vibrating
Rattling, banging, or vibrating from your exhaust hood fan often points to a worn belt, failing motor bearing, or debris caught in the fan assembly.
How fast can we respond?
Standard request
Within 40h
Submit a request today, we coordinate a vetted provider and confirm your slot.
Request serviceBoh coverage
Zero effort
On coverage, this service is scheduled automatically — before it becomes a problem.
See coverage plansWhat to do
Do not ignore worsening noise or vibration, as the failure point is usually closer than it appears. Schedule an inspection with a vetted hood service provider through Boh to diagnose whether the issue is the belt, bearings, or fan assembly before it becomes an emergency. Keep the hood running unless the noise becomes severe or the fan stops moving air effectively.
What's causing it
Hood fan noise in commercial kitchens most commonly comes from a worn or slipping drive belt that has stretched or cracked over time. Failing motor bearings produce a grinding or humming sound that gets louder as the bearing degrades. Grease buildup or a piece of debris lodged in the fan blades causes imbalance, leading to rhythmic vibration or banging. Loose mounting hardware can also amplify normal motor vibration into a noticeable rattle throughout the hood assembly.
What happens if you wait
A worn belt or failing bearing will eventually cause the motor to seize, taking your exhaust system offline entirely. Without a functioning hood fan, you lose the ventilation required to safely operate cooking equipment, which can force a service shutdown. Catching this at the vibration stage is significantly cheaper than replacing a burned-out motor.
LA County Health Code and NFPA 96 require exhaust systems to maintain adequate airflow during cooking operations, and a degraded fan that reduces ventilation capacity can result in a failed health inspection.
How Boh handles it
Boh dispatches a vetted, licensed provider to your location. Every visit is documented — before and after photos, service report, compliance certificate if applicable. You never chase a vendor.
Primary service
Restaurant Hood Cleaning
Fan and belt inspection is included in a standard hood cleaning service
Not sure where to start?
Tell us what's happening and we'll route you to the right provider.