Paint Booth Not Exhausting
Complete exhaust failure is a safety emergency. Stop
What You're Experiencing
The paint booth is not exhausting fumes at all. Overspray is not being pulled out of the booth, solvent vapors are accumulating, and there is no perceptible...
Visual Signs:
- No air movement visible in booth
- Overspray hanging in the air instead of being pulled out
- Manometer showing zero or near-zero reading
- Exhaust fan visibly not spinning
Sound Signs:
- Complete silence from exhaust fan area
- Motor humming but fan not spinning
- Unusual clicking or buzzing from electrical panel
Safety Risks — Read Before Proceeding
Explosive atmosphere in booth
Action: STOP ALL PAINTING. Evacuate booth area. No ignition sources.
Oxygen-deficient atmosphere
Action: Do not enter booth without proper respiratory protection and LEL monitoring.
Acute solvent exposure
Action: All personnel must leave booth area immediately.
Immediate Steps to Take
- 1
STOP all painting operations immediately
- 2
Evacuate personnel from booth and surrounding area
- 3
Do not use any ignition sources (no welding, grinding, smoking)
- 4
Check if exhaust fan disconnect/breaker is on
- 5
Look at exhaust fan—is it spinning at all?
- 6
Check VFD for fault codes
- 7
Call WERCS emergency line if issue cannot be immediately resolved
Common Causes
Here are the most likely reasons you're experiencing this problem, ranked by how often we see them.
Electrical Supply Failure
commonThe circuit breaker has tripped, disconnect switch is off, or there's a power supply issue to the exhaust fan motor.
Belt Failure
commonThe drive belt connecting motor to fan has completely broken. The motor runs but the fan doesn't spin.
Motor Failure
occasionalThe exhaust fan motor has failed due to overheating, bearing seizure, or electrical fault.
VFD Fault
occasionalThe variable frequency drive has faulted and shut down the motor. Check for fault codes on the VFD display.
Safety Interlock Tripped
occasionalA safety interlock (door switch, fire suppression, gas detection) has tripped and shut down the exhaust system.
Control System Failure
rarePLC or control panel has faulted, preventing the exhaust fan from receiving the run command.
Interactive Diagnostic Tool
No Exhaust Emergency Diagnostic
Step 1 of 5
Is the exhaust fan motor running (can you hear it)?
If unsafe at any point: Complete exhaust failure is a safety emergency. If you cannot restore ventilation within 15 minutes, call WERCS emergency service at (877) 489-3727.
When to Call WERCS
While some issues can be resolved with basic troubleshooting, these situations require professional service:
- You cannot identify why the fan stopped
- The motor is not running and won't start
- Belt replacement is needed
- VFD continues to fault after reset
- Any safety interlock issue you cannot resolve
- You need emergency restoration of ventilation
Paint Booth Not Exhausting FAQ
Common questions about this issue
Have a question not answered here?
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