Electronic device with cooling fan

An electronic device having an internal cooling fan, the electronic device comprising:

• a fan assembly attached to a keyboard assembly, the fan assembly comprising:
• a fan enclosure having, on a surface, an inlet opening and an external protrusion;
• and
• an impeller at least partially inside the fan enclosure;
• and
• a bottom case, the fan assembly positioned between the keyboard assembly and the bottom case and oriented such that the inlet opening and the external protrusion face the bottom case,
• wherein the external protrusion maintains a passage between the fan enclosure and the bottom case that allows air to enter the inlet opening, wherein the entire external protrusion is positioned on a side of the inlet opening that is opposite of a diffuser portion of the fan enclosure, and wherein at least a portion of the passage extends continuously from an inner surface of the bottom case to a surface of the external protrusion closest to the inner surface of the bottom case.