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Extractor Fan For Island Hob If you have an island hob then you will need a specialised extractor fan to fit above it. These work by ventilating the space by pulling wetness, smoke and odours away from your kitchen. A ceiling extractor is a smooth choice that sits flush with the ceiling and is developed to blend in. These work by recirculating air through charcoal filters so they can be fitted without the requirement for ducting vents. Induction hob