It is effective to install it while paying attention to the following three points.
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Do not increase airflow resistance (Figure 1)
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Prevent stagnant air inside (Figure 1)
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Avoid creating short wind paths (Figure 2)
For these reasons, it is ideal to install the fan in a direction that allows the air from the fan to flow evenly without being blocked, as shown in Figure 3.
When installing the fan in this way, there is essentially no difference between pushing air in and blowing air out, but blowing air out is more effective in terms of equalizing the internal temperature.
Figure 1 Figure 2 Figure 3