Have been using this Orico model for a couple of years and just bought another one. The fans can be moved and removed, but only in one direction. They blow air from top to bottom when installed. The fans use USB if I'm not mistaken. Very durable and if your machine is bottom vented or would benefit from this type of venting, the mid-to-mid power fans get the job done with no frills. It is very large and not ideal for carrying. The old ones were black and now they sell them in silver. They have strong rubber feet that are difficult to move if you hold on to them, it's really hard asphalt rubber. I would buy again if I needed something like this. Thanks Oriko.
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