The Manrose 120mm Extractor Fan is designed for larger bathrooms, toilets, cloakrooms and medium sized rooms, the 120mm (5") series of fans are 56% more powerful than their 100mm (4") counterparts, yet only 10% larger in surface area. These fans are double insulated and do not require an earth. All wiring must comply with current IEE regulations. A double pole isolating switch, having a contact separation of at least 3mm in all poles, must be used with a 3 amp fuse fitted. The 120mm (5") series complies with the Building Regulations on Ventilation (F1) Mounting: Wall Noise: 41.