11 Air filter panels, being part of air filtering units for removing dust, smoke and allergens from the air; air filtering units for removing dust, smoke and allergens from the air; chillers for industrial process cooling; filters for waste gas purification; flare stacks for use in the oil industry; gas condensers, other than parts of machines; gas generation plants for industrial purposes; gas liquid separators; gas purification machines for industrial use; gas purifiers; gas scrubbers; heat exchangers, other than parts of machines; oil purifiers; separators for the cleaning and purification of gases; water cooling towers; water filtering units for industrial use; adsorption apparatus for generating gas; membrane apparatus for generating gas; cooling appliances, namely fin-fan radiators not for use in vehicles