Hi Marit,
I have a retail storefront and small letterpress studio that share the same space (letterpresses are behind the counter). It is situated in a century-old building with stone and brick walls. I do not have a ventilation system, but I use odorless mineral spirits and rubber based ink.
Most customers that come in when printing is taking place comment that they like the smell!
There have been some instances where I wish I could have ventilation (usually just when I daydream about adding a polymer platemaker, rubber stamp making machine or laser cutting to my offerings). 😉
I’d say there’s no harm in getting a quote to see if it makes sense budget wise, but you probably don’t require it.
Andrea
P.S. If paying for an improved ventilation system would give you control over humidity, that would definitely be a perk. In our experience, there’s a real fluctuation with results being near the ocean.