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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.
ffm
rhowe
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?