They are designed to operate in larger than standard ventilation ducts. And used engines bearings significantly extend the service life of the product.The item "Metal Inline Extractor Fan 325mm 12.8 Commercial Industrial Duct Ventilator WK" is in sale since Friday, March 14, 2014. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Other Heating, Cooling & Air". The seller is "prostkoltd" and is located in Leeds. This item can be shipped to European Union member countries, Antigua and barbuda, Australia, United States, Bahrain, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei darussalam, Dominica, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French guiana, Iceland, Jersey, Jordan, Cambodia, Saint kitts and nevis, Saint lucia, Liechtenstein, Sri lanka, Macao, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion, Turks and caicos islands, Aruba, Saudi arabia, South africa, United arab emirates, Ukraine, Chile, Bahamas, Colombia, Costa rica, Dominican republic, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, El salvador, Trinidad and tobago, Uruguay, Viet nam, Cayman islands.