5 Best Box Fans - Jan. 2022 - BestReviews
Fan size. Most box fans are roughly the same size, with a blade diameter of 20 to 21 inches. Because they’re fairly large, they require more space than some other types of fans. However, they typically provide more effective cooling power as a result. CFM. Like all fans, a box fan’s power is measured by how much air movement it provides.
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