The Chassis Air Guide consists of a hollow tube with a flared end that guides cool room ambient air towards the processor.  It has no fans and is therefore a completely passive cooling solution.  It relies entirely on the internal processor fan to guide air to the processor and to other components.

Intel Chassis Air Guide is more than just adding fans, open vent, or a tube.  It's a pattern of how the internal air is flow to provide an adequate cooling for all internal components, not just the processor.  This requires proper opening from the front, side, and rear of the enclosure.

A 60mm side air duct, which draws outside cool air directly onto the processor core.     

A 80mm rear fan or larger to provide a minimum of 39 CFM (in free air) of flow is recommended to exhaust the chassis. 

Upgrade from 60mm side air duct to 80mm side air duct for better air flow.  This drawn more outside cool air directly onto the processor core and other components.

Upgrade from 80mm rear  fan to 92mm rear fan or larger for better chassis exhaust and noise reduction. The 92mm or larger rear fan provide a minimum of 55 CFM (in free air) of flow is recommended.

This is the add-in cards side vent. This vent acts as a system inlet and provides air through the add-in cards.  High performance graphics cards like next generation PCI-Express graphics card will benefit this greatly.  For this inlet to be effective, the front bezel must allow adequate air flow.