Printrbot Simple Metal Fan Shroud / Extruder Shield

Here's a different approach to a Simple Metal Fan Shroud. Instead of funneling the air into a small area near the surface, which restricts airflow and causes blowback, I decided to shield the area that I don't want to cool: the extruder. This results in zero blowback and unrestricted airflow.
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The funnel-style fan shrouds provide a more targeted deposit, but to get this, they must choke the airflow. The theory behind my shroud -- what I'm hoping anyway -- is that the build plate will receiv