Do you require Aerosol suction in every procedure apart from dental prophylaxis? If so what is the ratio of this per dental section, let us say if you have 4 dentists, would one Centralizes intraoral evacuator and 3 Extraoral oral evacuator/extra Aerosol suction machine (Vasctation) suffice for 5 dentists? At the moment we have Ventilation Air Conditioning System installed that provides entry of clean air and exit of used air. Each dentist also have special Op-D-Op II Face Shield Kit.