About this item【Excellent Ventilation Performance】: Our bathroom extractor fan is meticulously crafted to excel in dehumidifying, deodorizing, and purifying, guaranteeing a consistently fresh, clean, and hygienic bathroom environment. Its exceptional extraction power effectively fights off moisture, mold, and mildew, fostering a healthier indoor atmosphere conducive to well-being.【Easy Installation】: The bathroom fan duct diameter is 100mm (4 inches), and the panel size is 150x150mm. It is easy to install with standard tools. The 4 inch window exhaust fan for the bathroom can be installed on windows, doors, and panels. Note: Blue is neutral, black/gray/red are live conductors, yellow/green is earth (can be connected or left unconnected).【Improved A.