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Connected with a spiral aluminum pipe φ150. All extractors over 100€ have a φ150 output and the manufacturer tells you in the manual: if you use a φ125 the extractor will have 35-40% reduced performance and will make more noise. And what do the plumbers and contractors do? They use φ125 because that's what they used in 1952, ignore the others who make PVC pipes that only have φ125 and so you pay for an extractor and you don't have one.
This one works very well on the second speed, you can barely hear it. With φ150 I say it again. Even on the third speed, the noise is low and pleasant.
Installation is relatively easy, I didn't use the internal flaps because I have a cover on the wall with flaps that open and close.
One last thing, it's not stainless steel, it's painted gray, only the filter is stainless steel.