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6'' Inch / 150 mm Exhaust Hood Vent with Rain Cover, Black/Anthracite, Indoor and Outdoor Air Vent Cover, HVAC Exhaust Vent Duct Cover, Inch Exhaust Cap (6 Inch, Black/Anthracite) : Amazon.co.uk: DIY
100cm Wall Mounted Cooker Hood - Stainless Steel
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423 | 10-Inch Round to Rectangular Transition for Range Hoods and Bath Ventilation Fans
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Cyclone 680 CFM Round/Rectangular Duct Opening, 30 in. Under Cabinet Range Hood, Filterless Technology, Easy Clean, Black NA940DB - The Home Depot
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Rangehood Rectangular to Round Adaptor - JPM International Pty Ltd.