A+ means that the product is best rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Directive 2010/30/EU. A+ Gaggenau AC250121, 933 m³/h, Ducted/Recirculating, A, E, 56 dB, 637 m³/h Gaggenau AC250121. Maximum extraction power: 933 m³/h, Type of extraction: Ducted/Recirculating, Fluid dynamic efficiency class: A. Type: Ceiling built-in, Product color: Bronze, Cord length: 51.2" (1.3 m). Grease filter type: Stainless steel. Energy efficiency class: A+, Annual energy consumption: 35.2 kWh, Energy efficiency scale: A+++ to D. Width: 47.2" (1200 mm), Depth: 19.7" (500 mm), Height (min): 11.8" (30 cm)