Hello, in May I have to install a roof fan in the area of the kitchen. There is a normal hatch 40cmx40cm. It comes out and the Thule Vent comes in. However, the Thule has suggested my dog. He meant that this is better than e.g. the Fiamma which is screwed with 12 screws and the danger is significantly greater for leakproofness. What experience do you have? Which hood would you recommend?