| PROBLEM | RESULT | HOW TO FIX |
| Fan belts old & worn | Fans run less efficiently; belts break, smoke filled kitchen | Replace belts |
| Bearing making a noise | Bearing can burn out resulting in expensive damage to fan | Replace bearing or fan |
| Fan belt loose | Fan runs inefficiently, wasting power | Adjust belt tension or use smaller belt |
| Grease leaking onto roof | Makes a mess! Also grease can rot roof resulting in leaks during rain and costly roof repairs | Correct poor fitting or broken seal on elbow joints; squirrel cage type fan may need a “grease diverter” with cups to catch the grease |
| Motor stopped | Kitchen fills with smoke | Locate electrical problem (example: breaker or switch on the roof) or install new motor |
| Motor noisy | Usually the bearing, see above |
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| Fan noisy | Possible damage to fan and shaft | Balance fan, remove foreign object (like a chef’s hat) or replace already damaged fan |
| Mushroom fan installed so it can not be properly cleaned | Poor cleaning result; fan can be damaged while being cleaned | Install hinges, lengthen electrical wiring and install chain stops |
| Fan not pulling enough air | Kitchen gets hot and stuffy | Change loose fan belt; clean or replace filters; replace door that was left off; install bigger motor; increase make up air from cooler |
| Grease traps overflowing onto roof | Mess and eventual damage to roof | Empty more often or replace grease traps with Driploc Grease Containment |
