[sdiy] Fume extraction

[sleepy_dog at gmx.de]

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