A little thread revival.
I got this one:
https://www.amazon.com/gp/aw/d/B07FLLGCGS?psc=1&ref=ppx_pop_mob_b_asin_title
It's in an enclosure, so it's less exposed. I just installed it on my bathroom fan. Haven't noticed any noise from the controller itself and the fan motor is much quieter at lower speeds.
I'm tempted to try a reversible version on one of the other fans, but I'm not entirely convinced there is a need for reverse. I suppose it could be useful to force in air through one fan while the other two blow out, but you could just as easily leave that one fan off and air will get sucked in through that vent anyway.
I got this one:
https://www.amazon.com/gp/aw/d/B07FLLGCGS?psc=1&ref=ppx_pop_mob_b_asin_title
It's in an enclosure, so it's less exposed. I just installed it on my bathroom fan. Haven't noticed any noise from the controller itself and the fan motor is much quieter at lower speeds.
I'm tempted to try a reversible version on one of the other fans, but I'm not entirely convinced there is a need for reverse. I suppose it could be useful to force in air through one fan while the other two blow out, but you could just as easily leave that one fan off and air will get sucked in through that vent anyway.