Bellow Duct Assembly Complete, made of Meta Aramid/Para Aramid Fabric with Silicon Rubber Coating on both sides with Metallic Frames & Fire Retardant EDPM Gasket on Both sides. 2 Nos. each for Fresh Air & Return Air and 01 No. for Supply Air per RMPU as per RDSO Spec. NO: RDSO/PE/SPEC/AC/0197- 2020 ( REV-1 ) and Drg. No. RDSO/PE/SK0069-2004 ( Rev-3 ) or latest for RMPU of LHB AC Coaches./14261988A/107194875