Ductless Fume Hood Our ductless fume hood research and development laboratory analyses your questionnaire so that our customer department can help you to choose the most appropriate captair ductless fume hood enclosure in accordance with your handling. Our after-sale service department can take care of the maintenance of your ductless fume hood and in case of changes in your chemical handling can determine if a new filter type is needed. Today, the erlab group, 7 subsidiaries around the world (United states, Malaysia, Germany, Spain, Italy, UK and China) - insures the quality of its products and the safety of its users through its compliance with today’s most demanding ductless fume hood standards.