Bigger than I thought 3 fan system for Evo 13.5 so a bit overkill. We don't notice it turning on, although it's mostly in our bedroom next to the main bathroom, so it's pretty quiet, but definitely not quiet. I hooked it up to a temperature controller and live where the temp is 106° for several weeks leaving 78° (+/-) 1° in my tank. pushes well. I would buy another.
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