D 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. D Electrolux EW6SN406WP, Front-load, 6 kg, C, 76 dB, 951 RPM, D Electrolux EW6SN406WP. Loading type: Front-load. Rated capacity: 6 kg, Spin-drying class: C, Noise level (spin): 76 dB, Maximum spin speed: 951 RPM. Product colour: White. Width: 595 mm, Depth: 378 mm, Height: 843 mm. Energy efficiency class: D