AUPU heavy-duty bath fans - AF50G1, AF50L1: . * Compact design for small rooms, such as bathroom,shower, bathtub, toilet, utility room, laundry room * Very quiet operation * Efficiently to remove moisture, carbon dioxide and odors * Long-life ball-bearing motor * Built-in damper to prevent air-backdraft * Easy installation * Duct diameter: 100mm (or 4 inches ) *With ahalogen light (35W or 50W) * White color . Keywords: fan, exhaust fan, bathroom fan, ventilating fan, ventilation fan, bath fan,ceiling exhaust fan, ducted exhaust fan, greenhouse exhaust fan.