The extraction rating is vital to the working of your Chimney It is recommended to go for a chimney that can filter the air in your kitchen at least 10 times per hour.

For eg. if your kitchen volume is 30 m3 (4m x3m x 2.5m) and the chimney’s capacity is 300m3 per hour, then it will filter your room approximately 10 times per hour (300/30 =10) or once every 6 minutes