We provide Tender Bidding Support for Supply of Dry Type Return Air Filter Size- 550X500x50 Mm With Stainless Steel Frame, Filter Media Used Shall Be Of Synthetic Non Woven Polyester Coated Having Fire Retardant Property And Suitable For Rmpu Type Ac Coaches, Confirming To Rdso Specn. No. Rdso/Pe/ Spec/Ac/0055 -2003 Rev.2 And Drg. No. Rdso/Pe/Sk/Ac/0057 -2003 Rev.2 Item-2 Of Sheet-1 . Warranty Period: 30 Months After The Date Of Delivery