What is the difference between recirculation and extraction ventilation hoods?

Recirculation vents and extraction vents are forms of ventilation hoods which can be used in the home. Recirculation hoods draw air into the appliance through the filters in order to neutralise odours and remove grease particles. The cleaned air is then returned into the kitchen. Recirculation hoods are mainly used in apartments and require carbon filters (which need to be changed roughly once a year).

The extraction hoods filter air with a metal filter grease trap before releasing it through an outside vent therefore they require a vent through an outside wall. They are a highly effective form of filtration that removes grease, odours and excess moisture from the air in your cooking environment.