This fan is well designed, I use it in combination with the USB silent fans I have fitted to my amp. I bought these fans to cool my amp which is in a fully enclosed space in my entertainment center. After installing the fan at the top and back of the enclosed area, I also made a 3 inch hole at the bottom required for installation. You should have an exhaust fan at the top of the area and an intake at the bottom unless it's a totally enclosed space as the temperature in the enclosed space will definitely drop. I have two fans on top of the amp and an exhaust fan on the back of the entertainment center in addition to my 3" air intake (see picture). These fans are extremely quiet and have 3 speeds and can be connected in series. Best of all, they can be controlled via the USB input on the back of your TV or amplifier, or run on 120V, both included. I use one of the USB ports on the back of the TV to power these fans. So they're only on when I'm using the TV and entertainment center. Andrew and the customer service was excellent from this company. on the CE list. Watch my video to see how I installed them. There is also a photo of three installed fans with a description.
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