... the attached drawing, also customizationWe also supply the customized fresh air device according to customers bus A/C requirement Features · ... (Switzerland, Germany, Southern Korean, etc ), Pass the QS9000, ISO9001, UL, CE certification.· Equipped with American- produced poly filter gauze, Clean ... with the fixing nut, which convenient ?the assemble. Fresh Air Ventilation for Bus Air Conditioner (XF-5)