Rhythmic Fan Humming is driving my customer crazy

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One of my customers has changed out fans in 3 rooms several times and each one gives the same rhythmic humming.
Are the ducts for any of these fans tied together? It could be that two or more fans sharing a duct could be setting up some kind of oscillation. I've heard that this is one of the reasons connecting exhaust fans is no good.
 
I don't think you'll ever satisfy your customer because he just says over sensitive hearing. Every fan will make some type of noise moving the air alone will make a sound so it seems to me like it's a no-win situation
 
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