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I have experience but in the wrong way. We had oil heating and extraction was never an issue. Moved to gas heating (unlimited hot water), and we have a huge issue with damp. I can’t advise on the solution as we haven’t worked it out yet.
I can advise that, at some stage, we will need the bathroom repainted [F&B) and possibly, a little bit of plaster replaced.
I’m not happy. We have moved the extractor vent to right above the shower and that has helped but not enough. A spark looked at our in line fan and said it was fine - strong enough etc but not to extract the massive amount of steam from a 30 minute shower. My daughter likes long showers! -
If it's the "rigid" part that you're wondering about, I found that our rubbish wall-mounted fan was more effective when I replaced the corrugated duct with smooth, rigid ducting. Also, I've never worked out how you deal with dust buildup in an inline fan. It certainly builds up in corrugated ducting and on fan blades, which reduces their efficiency slightly.
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TGR
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@hamrack
Bathroom extraction, specifically duct sizing - does anyone have experience in this?
It's definitely going to be an inline fan in the loft, just trying to work out what size ducting to specify. I believe the fans being supplied are 4", but is there any reason not to ask for 5"/6" ducting beyond cost?
I'm already asking for insulated as this will be going through the loft, but insulated rigid ducting is several times more expensive - how critical is this?