Several types of ventilation systems are used in catalytic processes: 1. Natural Ventilation: Relies on natural air flow to remove heat and byproducts. Suitable for processes that do not generate significant heat or harmful gases. 2. Forced Ventilation: Uses fans or blowers to enhance air flow. Essential for processes generating significant heat or involving toxic gases. 3. Local Exhaust Ventilation: Targets specific areas within the reactor to remove contaminants. Often used in conjunction with other systems for maximum efficiency.