HP T5720 - Compaq Thin Client Hardware Reference Manual page 42

Thin client operation
E-6
■
Do not place materials on thin clients that block the vents. Thin
clients require proper ventilation to maintain operating
temperatures.
Do not block the vents of the thin client
■
Do not position the thin client vertically without using the stand.
Do not position the thin client vertically without using the stand
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Hardware Reference Guide