supply of return air filter and%a0fresh air filterreturn air filter and%a0fresh air filter,return air filter suitable for vande bharat rmpu of sidwal make as per rdso spec: rdso/pe/ spec/ac/0055-2003 rev-2 for train set coaches. note- sample must be approved by the consignee before bulk supply. [ warranty period: 12 months after the date of delivery ] ] , fresh air filter suitable for vande bharat rmpu of sidwal make as per rdso spec: rdso/pe/s pec/ac/0055-2003 rev-2 for train set coaches. note- sample must be approved by the consignee before b ulk supply. [ warranty period: 12 months after the date of delivery ] ]