What about fumes, dust and steam?

Each needs a different answer. Acrylic nail dust wants extraction at the desk where it is created. Wax, acetone and product need enough air changes to clear the room between clients. Steamers and backwashing add humidity that has to leave the building or it settles on the glazing. A therapist working with heat or oils has different requirements again, so we specify them separately rather than fitting one vent and hoping it covers everything year-round.