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Think of air circulation in terms of the circular motion of the air before and after the air filter. The air exiting the filter is exhausted at a higher velocity than that entering it. Consequently, exhaust being vented inside a building can have an effect on the pattern of air circulation. Air circulation patterns will vary depending upon which method is used and according to your specific shop setup. Figure 4 shows an example of good air circulation. Filter Figure 4. Good air circulation. The