Two completely different things sit under one name here: internal fans, fitted in place of a factory one that has worn out or started droning, and external cooling pads, on which the laptop simply stands. An internal fan has to be chosen by the specific model series — even versions from the same line often differ in connector and housing shape. Pads, from Trust for example, are picked by screen diagonal, so the laptop does not hang over the edge.
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Two completely different things sit under one name here: internal fans, fitted in place of a factory one that has worn out or started droning, and external cooling pads, on which the laptop simply stands. An internal fan has to be chosen by the specific model series — even versions from the same line often differ in connector and housing shape. Pads, from Trust for example, are picked by screen diagonal, so the laptop does not hang over the edge.