Hi – I’m looking at replacing my current hood with an Elica Ascent sloping hood. The tech spec states 150mm ducting is required. I’ve currently got 100mm and can’t realistically change it. Is it ok to add a reducing kit (I know efficiency goes down/noise levels go up) but will it cause any problems for the hood motor etc? Reason I ask is that another hood I was looking at (Luxair Hubble) said reduction kits could not be used, where as Neff helpline have said for their products one can be used. I’m confused – Any guidance greatfully received.