more information www.bosch-home.com.au | 99 Calculate the extraction power you need When choosing a rangehood, always match its air extraction power to the size of your kitchen. An effective rangehood should be able to replace the air in your kitchen up to 12 times per hour. Extraction rate needed for your hood Kitchen Volume of kitchen x 12 = Max. Extraction size (Lx W x H) (m³) rate needed Small 3 x 4 x 2.5m x 12 = 360m³/h Medium 4 x 4 x 2.5m x 12 = 480m³/h Large 4 x 5 x 2.5m x 12 = 600m³/h Open plan* 4 x 8 x 2.5m x 12 = 720m³/h Calculate yourself x 12 = * For open plan kitchens 50% of the adjacent room to the kitchen is added to the extraction rate calculations. Above example: Open plan room size: 4m x 8m x 2.5m Actual kitchen size: 4m x 4m x 2.5m Extraction rate calculations: 4m x 6m x 2.5m Height: 2.5m Length: 4m Width: 4m