These are an effective way of removing smoke due to cooking from your kitchen. They typically are better than exhaust fans as they suck the smoke immediately and presence of several international brands like Glen, Elica, Faber and Gilma give various options at suitable prices.
It saves the ceiling above the cooking area to get damaged and also smoke spreading to other rooms.They come in two types - traditional and designer. The traditional ones are a utility removing smoke. The designer ones on the other hand also enhance the decor of the kitchen.