NCR S26 - Manual (Page 25)

Positioning the System
NCR S26 Hot Plug Server User Guide 2-7
When standing the system with the fan against a wall, leave a space of
5-10 cm from the wall to allow air circulation, then position the legs as in
“Position A” below.
When standing the system with the fan facing out, you can put the system
close to the wall and position the legs as in “Position B” below.
Figure 2-4. Allowing for Air Circulation (Bottom View)
Fan Fan