Product review (5 stars): Great vent hood for use on a garden shed wall.
I've now used 2 of these vent hoods in my garden shed project.  I modify the vent hood to mate up to a 120mm PC case fan for exhausting hot air from inside the shed.  If interested, there's a video on YouTube showing the modifications and installation entitled: "Solar Shed Project, Part 8 - Mission Accomplished" if you are interested in the details.