How to clean and maintain Acer Aspire 4920 ventilation system

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How to clean and maintain Acer Aspire 4920 ventilation system: crwdns2935265:00crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

After unscrewing, we lift up leftside of the cover and gently shake it to take out.
Take care of the small plastic patches. Do not make them broken. They help to lock the cover firmly to the bottom housing of the laptop

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