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A Guide to Buying a Kitchen Extractor Fan A kitchen extractor fan, also called a cooker hood, gets rid of steam, smoke and undesirable cooking odours from your kitchen space. They can also add an additional style statement to your kitchen design. Unlike wall or integrated cooker hoods, island extractor fans hang directly from the ceiling. They are usually ducted to either an external vent or through a charcoal filter for recirculating (Which?). Ventilation Extractor fans are used to clarify in restrooms, cooking areas and utility room