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There are many points that you need to analyze, when it comes to consider the factors of these fans. One among several aspects is the power of the fan, and depending on how you plan to use the fan, you have to take into account the amount of cooling power a fan can produce. For that you need to check the airflow and it is measured in cubic feet per minute (CFM), which measures the volume of air flowing by a given point for every 60 seconds.