Asus Mini PC PN51 Manuel De L'utilisateur page 14

Rear view
14 PN Series
HDMI™ port
The HDMI™ (High Definition Multimedia Interface) port
supports a Full-HD device such as an LCD TV or monitor to
allow viewing on a larger external display.
NOTE: When using only this port as a display
output source, this port will support a resolution of
up to 3840 x 2160 @60Hz. The resolution may also
be affected by the cabling and output device.
Air vents (exhaust vent)
The air vents allow your Mini PC chassis to expel hot air
out.
IMPORTANT: For an optimum heat dissipation and
air ventilation, ensure that the air vents are free
from obstructions.