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Finishing Academy Paint Booth Training

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3.1 Introduction

3.2 Laminar Airflow

3.3 Pressure Differences Move Air

3.4 Draw-Thru Systems

3.5 Pressurized Systems

3.6 Incorrect Airflow Balance

3.7 Correct Airflow Balance

3.8 What Affects Balance

3.9 The Effects of Changing Balance

3.10 Affecting Balance Through Mechanics

3.11 Adaptations During Spraying

3.12 Conclusion

3.9 The Effects of Changing Balance

The most noticeable thing that happens is the filters become soiled with paint and particulates. This fact of life is a sign that the paint booth is functioning correctly. If the opposite were true, the paint booth would be greatly out of balance, and paint and particulate would soil the object and the floor or walls. As the filters become clogged, the exhaust fan sees a greater resistance to flow and moves less air. The intake fan is less likely to see a change to its resistance and continues to supply the same volume of air.

The effect is the zero point of pressure in the booth starts to migrate toward the center of the booth. Wherever this zero point is located a cloud of paint will be seen when the painter is working at that location. A velometer will also be helpful in demonstrating this effect. To move the zero point back to the intake of the booth, the exhaust fan must run at a faster rate to compensate for the increased static pressure.

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