An exhaust fan is a mechanical ventilation device designed to remove stale air, moisture, odors, and airborne pollutants from an enclosed area. It is commonly used in kitchens, bathrooms, and other spaces where ventilation is necessary to maintain air quality and prevent mold and mildew growth. By expelling unwanted air and drawing in fresh air, exhaust fans help create a healthier and more comfortable living environment. They come in various sizes and designs to suit different needs and can be installed on walls, ceilings, or windows. Regular maintenance, such as cleaning the fan blades and checking for any blockages, ensures optimal performance and longevity of the device.