[sdiy] Fume extraction

[Pete Hartman]

I've controlled speed on those DC muffin fans with a simple voltage divider
pot.  I have no idea how bad that might be for the fan, but I'm pretty sure
they don't require PWM or anything like that.

On Thu, May 19, 2022 at 12:08 PM Steve via Synth-diy <
synth-diy at synth-diy.org> wrote:

>
> Todd Sines:
> > Speaking of fume extraction, my DIY production and Mr. Fixit repairs
> have been in high gear over the last few years.
> > Not daily, but sometimes it’s all I do for a few days, 8-10 hours a day.
> I do not want occupational asthma, which I am sure I have been somewhat
> exposed to.
> >
> > What are your suggestions, aside from my current, which is an inverted
> CPU fan on adjustable “helper hands”, with a scouring pad to catch all of
> the “bad stuff”?
> > It became too much to wear a paint respirator mask all the time. But I
> hope I don’t regret this.
>
> I remember being demo'ed a cheap-ish build of something resembling a
> commercial fum extractor of this form:
>
> - box of plywood of adequate size.
> - angled back wall with two PC case fans in them or similar, pushing air
> outwards
> - and a layer of .. active coal or what's it called, as a filter
> - on the top of the box is an anti-static mat, somwhow fixed to it
> - in the whole top plate of the box, incl the mat, two slits, one near
> the back, one near the front of the top, of ~ 2cm (?) width, each going
> from left to right end, had been milled
> - the PCB to be soldered would be put in the middle, between those slits
> - the fans, causing suction close to those slits,  would suck the fumes
> away
> - there was a speed control box moutned on the side of the box, with a
> potentiometer to adjust fan speed i.e. degree of suction
>
> This worked nicely.
>
> Hah, whaddayaknow, I found photos of it:
> https://postimg.cc/2qDk3vYG
> https://postimg.cc/Hr5Wpzqj
> https://postimg.cc/kVvnS4Xm
> fan specs:
> https://postimg.cc/kBLX3zhk
>
> I don't have info on the speed controller.
> But I'm pretty sure this is cheaper than a comparable commercial product.
>
> - Steve
>
>
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