Industrial Grade G.I. Construction: Built with durable **Galvanized Iron (G.I.) housing and frame**, providing superior resistance to rust, corrosion, and wear in harsh industrial or commercial environments. High-Performance 18-Inch Diameter: Features a large **$18\text{ inch}$ ($450\text{ mm}$) blade diameter** capable of delivering extremely high-volume airflow for rapid and effective ventilation. Powerful, Continuous-Duty Motor: Equipped with a heavy-duty, robust motor designed for **continuous, long-hour operation**, essential for workshops, factories, foundries, and large commercial kitchens. Superior Air Extraction Rate: Engineered to move massive volumes of air per hour (measured in CFM or $\text{m}^3/\text{h}$), quickly exhausting smoke, heat, fumes, dust, and odors. Automatic Gravity Shutters: Includes built-in, gravity-operated aluminum shutters that **open automatically when the fan is running** and close when the fan is off, preventing backdraft, rain, and insect entry. Fixed Wall Mount Installation: Designed for **permanent, fixed wall mounting** in pre-cut openings, ensuring stability and optimal performance under high-power usage. Low Maintenance Blades: Features balanced, non-corrosive metal blades designed for efficient operation and minimal maintenance over their extended service life.