Very powerful fan. From my experience, the amount of noise it makes is fairly normal for a fan that can deliver this much air. I got them to replace the Sunon fans that were cooling the LED signs for my company, which were making strange buzzing noises. Compared to the Sunon fans, these appear to have a higher quality grade in terms of materials, about the same noise and more air power. The seller was very knowledgeable in helping me find the proper replacement and shipped fast.
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