Several types of ventilation systems are used in catalytic laboratories:
1. Local Exhaust Ventilation (LEV): This includes [fume hoods](#) and [ductwork](#) systems that remove contaminants directly from the source. 2. General Exhaust Ventilation (GEV): This system provides overall air exchange, ensuring that even dispersed contaminants are removed. 3. Dilution Ventilation: This method dilutes contaminated air with fresh air to reduce the concentration of hazardous substances.
