So the repair in the kitchen came to the end, it remains to attach an extract and you can rest ... installing the hood usually does not take much time, you should only be guided by some rules. If you purchase an hood with a challenge, then you just need to fasten the bolts on which the hood will be attached to the wall, then connect the air outlet itself and put it into the ventilation hole in the wall. Next, the air itself will come out. I do not advise experts to buy a corrugated discharge, since gas particles will settle on thread, which will significantly reduce the efficiency of the withdrawal. It is preferable to choose a direct air vent. And yet - in no case do not exceed the angle of fracture of the discharge by more than 90 degrees.