supply of main supply air bellow connection of fire retardant cotton canvas with frame (duct) stainless steel 304 grade,suitable for sidwal & intec make rmpu of lhb ac coaches size:700mm length,200 mm width and 172 mm height.cotton canvas used for duct as per drg.no. n/a specn: rdso specn.no.rdso/pe/spec/ ac/0136-2009(rev 0).main supply air bellow connection of fire retardant cotton canvas with frame (duct) stainless steel 304 grade,suitable for sidwal & intec make rmpu of lhb ac coaches size:700mm length,200 mm width and 172 mm height.cotton canvas used for duct as per drg.no. n/a specn: rdso specn.no.rdso/pe/spec/ ac/0136-2009(rev 0).,main supply air bellow connection of fire retardant cotton canvas with frame (duct) stainless steel 3 04 grade,suitable for sidwal & intec make rmpu of lhb ac coaches size:700mm length,200 mm width and 172 mm height.cotton canvas used for duct as per drg.no. n/a specn: rdso specn.no.rdso/pe/spec/ ac/0136- 2009(rev 0). [ warranty period: 30 months after the date of delivery ] ] => limited