Dell OptiPlex 755 - Cards; Installing a PCI or PCI Express Card

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DELL™ OPTIPLEX™ 755 TECHNICAL GUIDE
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chassis EncLosurE anD vEntiLation rEquirEMEnts
EncLosurE vEntiLation
If your enclosure has doors, they need to be of a type that
allows at least 30% airow through the enclosure (front and back).
EncLosurE MiniMuM cLEarancE
Leave a 10.2 cm (4 in.) minimum clearance on all vented sides of
the computer to permit the airow required for proper ventilation.
rEcoMMEnDED EncLosurE
Do not install your computer in an enclosure that does not
allow airow. This restricts the airow and impacts your
computer’s performance, possibly causing it to overheat.
opEn DEsk MiniMuM cLEarancE
If your computer is installed in a corner, on a desk, or under
a desk, leave at least 5.1 cm (2 in.) clearance from the back
of the computer to the wall to permit the airow required for
proper ventilation.