Noisy extractor fan

[Flibbertigibbettytoes]

We get a lot of noise from and through the extractor fan because a) the inner lining in the vent has come loose so it rattles about b) the end bit on the outer wall is plastic crap that doesn't close so we get a lot of noise from the road where it vents. The fan itself is very effective at drawing out steam and cooking smells.
I'm not sure who I could call to fix it or how to find a good end vent? Any advice? @pigletjohn still here? 🙏

I prefer the cowl vent. It has a single large flap, and a roof-like cover to deflect most of the weather and wind.

it can still make a noise in strong gusty winds depending on direction, but is much much quieter than the ones with a column of little flaps that look like a venetian blind. They are prone to rattling until the flaps break off, which does not take long.

Unless your bathroom is on the ground floor, it will need at least a ladder. Some builders and people who repair gutters or roofs are used to working at heights. I prefer not to. I use stainless round-headed screws which will last for many years and are easy to undo when old. IME they usually last at least 20 years, but coastal storms can damage them. On my house the dark brown one looks best and possibly resists sunlight ageing better than light colours. Or black. If necessary you can paint them, but do it before assembly and fitting, and use a single flowing coat of oil-based non-drip gloss. No primer or undercoat. Clean plastic with white spirit and a green nylon scourer before painting. Let it harden fully before handing or touching with tools. You can get stainless steel vents from specialist ventilation outlets, at greater cost.

Most bathroom extractors have a 4 inch/100mm duct. Rigid duct is much better than flexible hose, but takes longer to fit, and more competence.

https://www.screwfix.com/c/heating-plumbing/air-vents/cat840496?producttype=cowl_vent&cm_sp=managedredirect-_-hvac-_cowlvent

not clear from your post if this is a small fan or a large one.

There are other companies with a larger range of ventilation fittings, they usually sell aircon and expensive cooker hoods. I can't remember the one I used.

That's super helpful, thank you! It's a kitchen fan so on the ground floor luckily.