Return Air Filter, Type-1, Size 680 Mm Percent D7 415 Mm Percent D7 115 Mm, As Per Rdso Drawing No. Rdso/Pe/Sk/Ac/0073-2024 (Rev-2) And Conforming To Rdso Specification No. Rdso/Pe/Spec/Ac/0055-2003 (Rev-3), Suitable For Use In Rmpus Of Lhb Type Ac Coaches