F means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. F Electrolux EW6S427W, Front-load, 15.4 lbs (7 kg), B, 77 dB, 1200 RPM, F Electrolux EW6S427W. Loading type: Front-load. Drum capacity: 15.4 lbs (7 kg), Spin-drying class: B, Noise level (spin): 77 dB, Noise level (wash): 58 dB, Maximum spin speed: 1200 RPM. Product color: White. Width: 23.4" (595 mm), Depth: 19.1" (485 mm), Height: 33.3" (845 mm). Energy efficiency class: F