Dell OptiPlex 990 (Early 2011) - Manual (Page 5)

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CAUTION: Do not stack the equipment, place it in an enclosed space, or otherwise install
it where it is subject to heated air. The equipment should have at least 10.2 cm (4 inches)
of clearance on all vented sides to permit the airfl ow required for proper ventilation.
Restricting airfl ow can damage the equipment or cause overheating.
Venting Clearance Requirements
WARNING: To reduce risk of injury and/or
equipment damage, the AIO Stand must be
placed on a level, stable surface. WARNING: Risk of electric shock. Do
not expose electric parts to liquids.
≥ 4”
(102 mm)
≥ 4”
(102 mm)
≥ 4”
(102 mm)