Blow Air out.
If they pumped it in it would hardly be able to get back out and eventually it would stop everything from working - or when you switch it off after a certain amount of time it would give such a blow of air when the fan switches off that it would destroy the case!
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.