In my small 1-bay garage shop, I do some electronics soldering, brazing, rare welding, and some chemical things sometimes (like maybe cleanup with solvents or something).

So far when I want ventilation, other than just going outside to do it, I open the roll-up garage door. That sort of works, but destroys my climate control (i.e. freezes me in the winter and roasts me in the summer....I have a mini-split, but it can't keep up with an open garage door). Plus, ventilation still isn't that great even with a door open on one side, because the smoke just goes up to the ceiling and lingers because there's no cross-flow. The smoke just stays inside anyway. Unless I set up a fan to blow fresh air in, but then it's still not really a cross-flow situation, just stirring everything up.

I'm thinking I should put in a ventilation fan on the opposite side of the garage door to suck air out. Then, it would pull the smoke out from the ceiling, and I could just crack the front garage door if needed for make-up air, but at least it would exhaust the fumes out.

For a 200sq ft space, could I just use a bathroom fan for this? These are dirt cheap at the home stores. Or should I be looking for some specific type of exhaust fan for a garage, and what would the advantage be over a bathroom fan (maybe explosion-proof or something)? I made a plexiglass hood for my 3D printer. In the top is a $13 fart fan from the bathroom section of lowes. Then a flexible dryer duct I stick in the window. They make all sorts of different fart fans with different decibel and CFM ratings. From $13 to $. No ragrets. I say just do the math for how much air is in your space and how fast you want to be able to exchange it.

For a 200sq ft space, could I just use a bathroom fan for this? These are dirt cheap at the home stores. Or should I be looking for some specific type of exhaust fan for a garage, and what would the advantage be over a bathroom fan (maybe explosion-proof or something)?

A small bath fan right over your work area is probably enough.

200 sqft and 8 foot ceiling is only cubic feet. A 50 CFM bath fan will exchange all the air in the space in 30 minutes. You probably do not even need to open the door as there will be enough leaks in the overhead door and other places to provide make up air.

You don't need explosion proof. For the air to be so saturated with flammable gases that it might explode you would probably be dead already from breathing the fumes.

A range hood would be over kill unless you buy a variable speed unit. Many are 300 CFM or larger. 300 CFM will exchange all the air in 8 minutes!

A lower volume fan running constantly makes more sense to me that a large fan that sucks all the air out in a few minutes.

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