Dell OptiPlex GX240 User Manual page 94

On the small mini-tower computer, lift up the airflow shroud.
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A i r f l o w S h r o u d A d j u s t m e n t — S m a l l M i n i -To w e r C o m p u t e r
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1 airflow shroud
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I n s t a l l i n g U pg r ad e s