Introduction
The fan duct directs air across the heat sink on the logic board.
What you need
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Lay the iMac display-side down on a flat surface (putting a cloth under the screen to protect it from bumps).
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Loosen the three Phillips screws securing the rear panel to the iMac.
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Lift the rear panel slightly near the bottom of the iMac.
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Pull the rear panel toward yourself and remove it from the iMac.
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