One size doesn’t fit all when it comes to getting optimum performance. The right extraction rate and efficient ventilation is based on the size of your kitchen. A simple calculation you can do to work this out is to multiply the room’s length by width by height and then multiply that figure by 10.
For example, if your kitchen is 4m x 4m x 2.5m, you would need and extractor that is capable of a minimum of 400m3 per hour. This gives you the optimum rate of airflow for the room, based on the recommended need to change the air ten times per hour. A kitchen retailer can help you with this and advise appropriate models.