Kitchen chimneys come in two variants: a ducted chimney and the other is a non-ducted one. Out of these two, ducted chimneys are better. Ducted ones have some advantages over the non-ducted chimney. The suction power of chimneys is way better than ductless chimneys. The smoke or impurities are drawn out from the kitchen pass through a specific route from the ducted chimneys. It maintains the good quality air inside the kitchen. Along with it, ducted chimneys require lesser maintenance as compared to ductless chimneys. You will have to replace the duct in case there is a need to. However, a ducted chimney is a bit expensive than ductless chimneys. So, also consider your budget and compare different models before buying one.