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apc-
'Inline' is your search term. Duct, in-duct, or inline duct, etc. as well possibly.
They'll have different power ratings (Extraction Rate #m³/HR) which you can use to tell you how much they'll move - ie what is the most powerful at your price point. Internet advice is you want solid pipes not flexible ones. Your builder will want to use flexible ones because they're quicker and easier.
They look like this https://www.screwfix.com/p/manrose-mf100t-100mm-inline-extractor-fan-with-timer-240v/719gy
^not a specific reco just a pointer
Also they can be much bigger which makes them more powerful.
hugo7
We have just had this done; one for utility room downstairs, one for bathroom upstairs. You can barely hear them in the rooms but they suck a lot of air. If you go in the loft while they're on you can hear they're quite loud.