sparkync:
A ventilation system for nail salons here is required to have a plan prepared by an Architect or Engineer.
Usual is a 'common' exh fan, trunk duct. and a 'drop' at each workstation. Some have a 'on/off' switch at each station, some are a 'one switch' control at reception.
IMHO, the mechanical install of this type of system is best left to a mechanical contractor (HVAC).
