Likely Causes

1. Exhaust CFM below oven spec: Fumes accumulate and recirculate.

2. Cure setpoint too high: Overheats adhesive causing off-gassing.

3. Poor make-up air: Negative pressure pulls fumes into room.

4. Powder contamination: Foreigns burn and smell.

Quick Checks

• Verify exhaust CFM meets oven spec.
• Lower cure temp by 10°F and observe.

Step-by-Step Fix

1. Balance exhaust and make-up air — Ensures fumes are captured and replaced.

2. Reduce temperature / increase dwell — Achieves melt with less off-gassing.

3. Seal gaps and add duct extensions as needed — Improves capture at hood.

4. Replace suspect powder lot — Removes burnt smell source.

5. Implement housekeeping near tunnel — Prevents baked contaminants.