I don't know if this is a serious design flaw or a manufacturing issue. I saw another reviewer had the exact same issue. Once installed, the fan blows quite loudly and appears to be moving fairly quickly. HOWEVER, air movement is reversed so you have to sit behind the fan to feel anything, and a motor reduces airflow significantly. If you want a fan to move air instead of blowing directly at you and making it louder than your diesel engine then this is the one for you!
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