Variable speed fan

I once used a stock standard DIY shop extraction fan, connected to a dimmer designed for inductive loads.

Worked totally flawless for a very long time. (sold the house - probably still working)

Fan was quite loud at full blast, but whisper silent at ~30% duty. I used it in the bedroom for ventilation, so quitness was nice to have.

Your link page not found. If you only need to quieten the fan down you probably dont need a controller at all, see

NT

----------- Most small fans will have a shaded pole induction motor. You can use a variation of a dimmer to control this fan over a limited range but the device should be rated for motors rather than incandescent lights as the cheaper ones for lights may not handle switching an inductive load. As I recall it is about 1.5-2 times the price of one of similar rating for lights. I have one (designed for motors) on a fireplace blower and this has a lower limit setting which I set to avoid stalling (no cooling of the windings if the fan is not turning could limit its life)- something that I consider essential. This works well. Starting is at full voltage but the noise can be reduced appreciably -with an associated drop in extraction and it is fully adjustable between maximum and the minimum setting. A similar device in a kitchen extraction fan that I have is not as effective because the back pressure in the duct is a problem and less control is possible- a window unit should not have this problem. --

Don Kelly snipped-for-privacy@shawcross.ca remove the X to answer