supply of set of bellow duct along with metallic frame made out of meta aramid fabric with silicon rubbercoating on both sides as per rdso modification sheet no. rdso/2018/pe/ac/frs/0028 (rev - 0) & generaltechnical requirements for fresh, supply and return bellow ducts as per rdso frs no.rdso/2018/pe/ac/frs/0028 (rev-0). each set comprising of 5 ducts, i.e., one supply air duct, two return airducts and two fresh air ducts as per rdso drawing no. rdso/2018/pe/ac/frs/0028 (rev - 0).
