The mask will filter the fumes that you would normally breath directly into your lungs. I've used one for years. They work.
What the mask doesn't do, of course, is to prevent fumes from irritating your eyes. That's where good room ventilation and/or
a fan to draw the fumes away from your eyes will help considerably.

To further clarify, the type of face mask that filters dust, etc. is not the type that I use. The type that I use is equipped with
two "canisters" that will filter chemical fumes, including CA fumes.