chin_k wrote: July 17th, 2020, 8:54 pm I assume you already have some power nearby where your static vent.
Yes, I have all the wiring in there from the Deluxe fan that came in the Chinook (which I still have). I needed to take out the base to re-bed, so at that time I replaced it with one of the Fantastic low-profile bases. I was hoping that would reduce the wind noise (not so's you'd notice), and plus just didn't need that monster high base sticking up on the roof. With the low profile base, the inner flat part of the fan (where the knobs and stuff are) is just slightly tucked in above the garnish, and the opener knob is below that (but not below the Thin Lite that is right there too).
So anyway, the way the Fantastics work, once you have the "base" bedded onto the roof (high or low profile), then you can just put in different "guts" parts as you please. The five white screws you see (two by the opener knob and one in each other quadrant) are what hold the "guts" in. So I just put in a "static" guts piece to try it out. I like it. It's just a round hole with nothing blocking it at all (it does have the same screen). But I just tucked the wiring away on the sides for future reference.
You can also interchange their numerous lids. I'm using the "double-pane" clear one.
Since I like the static vent (and it lets in quite a bit more air with no fan going at all since the opening is not half blocked by fan blades), I thought maybe I'd put one of my (collection of

) powered Fantastic Vents in the bathroom. Typically the only time I have the fan going is in the evening after a warm day - when it's cool outside but still warm in the Chinook. Then it's nice to power suck that cool air in, but setting the Fantastic to blow out and cracking a couple of windows. But that might work fine with the bathroom vent going (as long as there is water in the toilet).
Anyway, I back-burnered that so haven't done anything on it.
One thing I just thought of though. If one were adding the PWM knob in the bathroom, there are lots of places to put it since there is a hollow cavity all around the shower stall (as long as it's not in a place where it would get sprayed). Maybe right up next to the vent (massive gap between shower stall and carpeted overhead).
Something tells me you are the one that should get the PWM going and report back

I bought a couple on either eBay or Amazon that have their own knob (but some don't have that). But I haven't figured out (actually, haven't tried) which wire needs to be "interrupted" by the PWM.