The 20" Industrial Exhaust Fan with Auto Shutter (2136 CFM) is a high-capacity ventilation solution engineered for large industrial and commercial spaces. With a powerful airflow output of 2136 CFM, it effectively removes heat, smoke, fumes, dust, and polluted air, ensuring a cooler, safer, and healthier working environment.The automatic shutter system closes securely when the fan is off, preventing backflow, dust, rainwater, and insect entry. Designed with a heavy-duty industrial motor and strong metal construction, this exhaust fan delivers continuous performance, durability, and energy efficiency for demanding applications.