Two different things share one name here. A cooling pad that sits on the desk, such as the Trust 20104 for machines up to 17.3 inches or the RGB-lit GXT1126 Aura, is an external accessory; the fan fitted inside the machine is a spare part. Internal fans are model-specific — searching for Acer alone will not get you there, because you need the machine's exact model designation, such as E5-731 or 5750G.
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Two different things share one name here. A cooling pad that sits on the desk, such as the Trust 20104 for machines up to 17.3 inches or the RGB-lit GXT1126 Aura, is an external accessory; the fan fitted inside the machine is a spare part. Internal fans are model-specific — searching for Acer alone will not get you there, because you need the machine's exact model designation, such as E5-731 or 5750G.