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The y-shape piece is freely rotatable, but achieving a shallower bend would require the extractor to stand further from the wall, which isn't an option space wise; the y-shape also sleeves down to 100mm, so while a shallower bend it puts the reduction very close to the machine -  good 90 bend at 125mm is probably less disruptive. Modding the base might be the solution (I'm already not using the castors, it's not going anywhere once installed), though then there's the flow from the outlet to the collector to worry about. Maybe just rewiring the control unit to move that to a convenient operating point.