So how many fans, and what size should they be? The answer depends on any number of factors. First, fans should be sized such that they do not interfere with everyday work activity (retrieving items from modules, forklifts, etc.). Then, space your fans such that one fan accelerates the air from its predecessor in the aisle. A good rule of thumb is to place the next fan when the previous fan’s air speed slows to 2-3 mph. Fan size (air throw distance) and aisle length (fan spacing) will determine the optimum number of fans per aisle.
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