How to clean and maintain Acer Aspire 4920 ventilation system

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How to clean and maintain Acer Aspire 4920 ventilation system: crwdns2935265:00crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

How to clean and maintain Acer Aspire 4920 ventilation system: crwdns2935265:00crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

After cleaning fan and its housing. We assemble fan wing back to fan base. The n assemble fan set back to the housing.
Take care of the marks to assemble the fan correctly

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