hi becky,
im not sure what size of machine your looking at mate, but i would say all you need is two small extractor fans/vents, similar to the ones you get on a kitchen window. (know the type i mean?) about that size, but maybe a little more robust motor as ide imagine it lasting longer “if used allot”.
anyway, what we have is two fans… about 10 inch diametre. they come with 2 directions of use. one sucking in air into the room and one extracting. to be honest though, we normaly only have the extracting one going coz its never really that smelly.
you do a bit of screen printing? well its not as smelly as that, so you have an idea at the very worst it can get, coz your using similar ink. based on that.
hope this helps a bit….