Rangehood vent to outside. How?

We have bought a Robinhood 90cm rangehood for our new kitchen and we want it to expel the air outside. This is a link to the hood :D. http://www.robinhood.com.au/products...00_Wall_Canopy
The plumber promptly said that he had never connected a rangehood to evacuate air to the outside of a house before and could I help with advice on this!!! :doh:
Does anyone know how this should be done? Should we connect it to a "Witches hat" or to a hole in the eave (both suggested in the rangehood installation instructions). Can't go straight through the wall as there is a stud right behind where the outlet will be. Do I have to get a ventilation technician or a roofer instead of a plumber? As far as I can see, all that's needed is about a meter of straight ventilation conduit and a piece of flexible ventilation hose!?

A previous place we rented had a small rangehood that expelled the air straight into my hair (I'm fairly tall). So after some greasy cooking my hair was as greasy as the frying pan. "The 1950's look" was then easy to achieve. :cool:
Anyway, I just don't get the point of having a rangehood that doesn't get rid of the air outside.


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