Vent fans (ventilation fans) are essential devices designed to improve air circulation within various indoor environments, such as homes, offices, and industrial spaces. These fans function by expelling stale, humid, or contaminated air and replacing it with fresh outdoor air, thereby enhancing air quality and promoting a healthier living or working atmosphere. They are commonly installed in areas prone to moisture and odours, such as bathrooms, kitchens, and laundry rooms, to prevent the build-up of mould, mildew, and unpleasant smells.