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With acrylics you don't need to worry about vapours just particles in the air, a mask like this is cheap and effective https://www.zoro.co.uk/shop/safety/reusable-respirators/maintenance-free-half-mask-ffa1p2-r-d-filters-4251%2B/p/ZT1259816X
I'm not sure a computer fan would have enough pull enough through. If you want to build something you're basically emulating this
https://www.amazon.co.uk/Display4top-Airbrush-Extractory-Portable-Extraction/dp/B07CG454GN/ref=asc_df_B07CG454GN/
You need 1 open side, filter at the back, fan to pull air through it and a duct to funnel the output somewhere, maybe another filter at the end of the duct. Personally I'd just stick with a cardboard box and £15 mask.
Sumo
Thanks!
I was wondering if I could make a cheap DIY one with a cardboard box, computer fan, 9v battery, and readily available filter (e.g. one from a hoover or cooker hood). Idea being that the filter would catch the paint and you wouldn't need to send the exhaust outside. Don't know if the paint vapour particles are too small though and you'd need a specialised (expensive) filter meaning that it would be cheaper to go with just pumping it outside?