supply of supply of 1) return air filter 2) fresh air filtersupply of 1) return air filter 2) fresh air filter,return air filter for vande bharat rmpu of sidwal make as per drawing enclosed as per spec: rdso/p e/spec/ac/0055-2003 rev.-2, with filter media complaince to en45545 hl2/hl3 suitable to be installed i n rmpu of vande bharat (train - 18) express. make filtech,sfpl or usha [ warranty period: 30 months aft er the date of delivery ] ] , fresh air filter of size - 203x190x60 mm suitable for rmpu unit of sidwal make available in vande b harat train, confirming to rdso specification no. rdso/pe/spec /ac/0055-2003 (rev-2) or latest. make filtech,sfp l or usha [ warranty period: 30 months after the date of delivery ] ] => limited