I work on rebuilding old carbs, too. Carbs older than we are.
Some with gas that's decades old. Just the fumes of that old gas can make me sick. Plus, I use solvent soak-tanks to loosen the old gas varnish. Breathing the solvent cleaners isn't safe, either.
Went the bathroom exhaust fan/range hood route in my first shop. It worked better than nothing, but wasn't as affective at removing the fumes as you'd think.
The biggest worry was that there was always the risk of an explosion if the fumes got to the right ratio of fumes to air being sucked past the motor and wiring connections.
When I built my present shop, I built a 23 x 14 side-draft paint booth (room), with exhaust duct work along one side of the room. That duct work leads to a 16 inch explosion-proof exhaust fan in one corner. The duct work also has one opening at head height, just above a parts washing tank in a corner of the room. The on/off switch is outside the door to the paint room so that there's no spark created within that room. The insides of the duct work are painted with a special anti-static paint to prevent sparks.
You don't have to get that elaborate, but you should be using an explosion proof motor, with sealed electrical connections, and the on/off switch located where the fumes can't get to it, or, use a sealed, explosion-proof switch. They do make smaller fans that pull less air so that your not heating the great outdoors as much.
Ordered the motor from a local electric motor rebuilding shop. You can order them on line now.
As I said, the kitchen range hood doesn't work as well as you'd expect....... unless you have a heat source like a stove causing upward convection currents. Gas fumes being heavier than air don't always want to go where you want them to. A "fume hood" is far better...The difference being is that a fume hood has sides so that only air and fumes can be pulled from where your standing. And some even have a clear plastic shield that covers the front from about chest height on up, to shield your face from any possibility of fumes tossed around by any air turbulence, plus any splash while working. A fume hood being just a simple opened front box can be easily build sitting on top of a work bench. And it's much better at keeping the stink away from your nose and lungs !