
- Report No.
- WERCS-SAMPLE-0142
- Inspection Date
- Representative specimen
- Facility
- Auto Body & Collision Center (SAMPLE)
- Equipment
- Downdraft paint booth + direct-fired make-up air unit (MAU)
- Booth Profile
- Downdraft cabin, approx. 26 ft L x 14 ft W x 9 ft H working chamber
- Inspector
- WERCS Field Service Technician
- Standards Referenced
- NFPA 33, OSHA 29 CFR 1910.107, NFPA 70 (NEC), manufacturer spec
AAirflow & Ventilation
| Parameter | Design Spec | Measured | Status |
|---|---|---|---|
Downdraft velocity (working plane) Below design. Tracks with loaded filtration (see Section B). | 100 fpm (design) | 74 fpm | Attention |
Exhaust volume Reduced draw from saturated exhaust media. | 14,000 CFM (design) | 11,150 CFM | Attention |
Booth pressure balance Negative balance pulls shop air and contaminants into the cabin. | Slightly positive (approx. +0.03 in. w.c.) | -0.02 in. w.c. | Attention |
Exhaust filter differential (magnehelic) Exceeds replacement threshold. Re-balance after media change. | Replace at 0.50 in. w.c. | 0.58 in. w.c. | Replace |
BFiltration
| Stage | Media | Condition | Action |
|---|---|---|---|
| Ceiling intake | Poly ceiling media (continuous roll) | Loaded, uneven loading across bays | Replace |
| Exhaust / paint arrestor | Panel paint-arrestor | Saturated (0.58 in. w.c.) | Replace |
| MAU rooftop pre-filter | 20 x 20 x 2 panel / mesh | Heavy buildup, elevated fire load | Replace immediately |
| Burner pre-filter | Not installed | Burner drawing unfiltered make-up air | Add poly pre-filter to protect burner |
CMechanical Drivetrain
- OKExhaust fan motor (10 HP)Amp draw within nameplate range · No action
- AttentionDrive beltsGlazed with minor cracking · Replace at next PM
- AttentionFan bearingsSlight noise at startup · Lubricate and monitor
- OKPulley / sheave alignmentAligned, set screws tight · No action
- OKVFDNo active or logged faults · No action
DHeating & Make-Up Air
- OKDirect-fired burnerIgniter and UV scanner cleaned and verified; stable flame
- OKBurner baffles / clamping platesSecure, no warping
- OKAirflow proving (pitot / pressure switch)Tubing intact, switch proves on startup
- OKCure temperature riseReaches setpoint within manufacturer time window
EControls & Safety
- CriticalSpray-to-ventilation interlockFound jumpered (bypassed). Spraying possible without adequate exhaust. Bypass removed and interlock restored on site.
- OKEmergency stopFunctional, latches and resets correctly
- OKRecirculating / exhaust damper linkageConnected and travels fully; no air shutoff
- AttentionBooth lighting88 fc measured vs 100 fc recommended at the work plane
- AttentionMagnehelic / manometerPresent and reading high, consistent with filter loading
FCompliance Summary
| Standard | Item | Result | Status |
|---|---|---|---|
| NFPA 33 | Ventilation velocity | Non-conforming until filtration restored | Watch |
| NFPA 33 | Spray + ventilation interlock | Corrected on site | Pass |
| OSHA 1910.107(b) | Booth airflow | Non-conforming until filtration restored | Watch |
| OSHA 1910.107(c) | Ignition sources / wiring | Conforming | Pass |
| NFPA 70 (NEC) | Fixtures and electrical | Conforming | Pass |
| Manufacturer spec | Filter differential | Exceeded, replace media | Fail |
GFindings
- CriticalSpray-to-ventilation interlock found bypassed. Restored on site; verify in operation before next spray cycle.
- CriticalMAU rooftop pre-filters heavily fouled, presenting an elevated fire load on the make-up air path. Replace immediately.
- ImportantCeiling and exhaust media loaded; booth velocity and exhaust volume are below NFPA 33 / OSHA minimums. Replace media and re-balance.
- AdvisoryDrive belts glazed and fan bearings noisy at startup. Address at next preventive maintenance visit.
- AdvisoryBooth lighting measures below the recommended 100 fc. Consider an LED retrofit for finish quality and energy.
HPrioritized Recommendations
- Confirm restored ventilation interlock under power
- Replace MAU rooftop pre-filters
- Replace ceiling and exhaust media
- Re-balance booth and re-measure velocity to confirm NFPA 33 / OSHA compliance
- Replace drive belts and service fan bearings at next PM
- Add a poly pre-filter ahead of the burner
- LED lighting retrofit