High-End PC from the guide. Need a fan?

Hey guys. I'm building a PC and I kinda decided to go all-in.

So, using the guide from Polygon and I recreated the suggested High-End PC on pcpartpicker canada (I'm canadian, yay!). I showed the build to a friend that will probably help me build the actual thing and he suggested that I might need a fan.

The build is here by the way : http://ca.pcpartpicker.com/p/37Cnk.

Is he right? Why the fan was missing from the initial build? Which one should I buy? Is there anything glaringly missing from that build?

Also, I know the motherboard is supposed to be wi-fi enabled. Does that thing is enough or should I get a better component for wi-fi connection?

I do know I would get better help on PC building website but since the guide is from here, I decided to ask here?

Thanks people!