An exhaust fan is a ventilation device used to remove stale air, smoke, heat, odors, and airborne particles from kitchens, bathrooms, or industrial spaces. It works by drawing contaminated air out of the room and expelling it outside, improving air circulation and maintaining a comfortable environment. Exhaust fans are typically made from durable materials like metal or plastic and are designed for continuous operation. In commercial kitchens, they are often installed above cooking areas to support hygiene and safety standards. Overall, an exhaust fan ensures effective ventilation, reduces heat and odors, and enhances air quality in indoor spaces.