Smeg 60cm wide downdraft extractor in stainless steel and black glass . Key Features . Energy rating B1 High performance motor 270 WElectronic controls4 speeds plus intensive (10 mins)1 x 7 W LED light2 Aluminium grease filtersFilter cleaning/replacement indicatorAutomatic switch-offInternal re-circulation possibleNon-return valveVent outlet Ø 150 mmNominal power 277 WExtraction rates IEC 61591 135-375 m³/hr (570 intensive)Noise level (dB(A) IEC 60704-2-13) 44-62 dB(A) (71 intensive) NB Downdraft extractors can be installed anywhere in a kitchen but are ideal for when a hob is situated in an island unit. The extractor is installed under the worktop directly behind or to the side of the hob so that when it is not in use it can be completely hidden from view. A Downdraft extractor can be vented or recirculated. When it is vented the ducting has to be passed under the flooring below the cupboards or along the back of the cupboards - it is important therefore to decide on the hood before refurbishment work begins. The length of the ducting will affect the extraction performance if it has to travel too far to go to an outside wall or there are too many turns in the ducting you are advised to recirculate the extractor. When using with a gas hob the hob must have a Maximum power of 12.4kW and 5 zones.. .