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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

3.7 Correct Airflow


Looking at a well-balanced system (Figure 4), the booth is at a negative pressure (relative to the outside) from the time the fresh filtered air enters the booth until it leaves through the exhaust filters. This is the same pressure profile as the draw-thru system. It is as if the exhaust fan were reaching out to the zero point of pressure in the booth and gathering the air, while the supply fan is pushing the air just enough to move it to the zero point of pressure in the booth.

It is best to design a booth to move the zero point of pressure in the painting chamber to the intake filter section of the booth. In this manner the fan reaches out to the filters and pulls the air through them into the booth. This is the same principle used in the draw-thru system.



So much for theory!



Well-balanced airflow system


Graphic by permission of Ron Joseph & Associates, Inc.



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