supply and installation of ms self support structure for exhaust pipe silencer guss factor landing platform access ladder with one coat of primer and 2 coats of enamel paint as per isi eqiv as per is 2062supply and installation of ms self support structure for exhaust pipe silencer for exhaust pipe guss factor landing platform access ladder with one coat of primer and 2 coats of enamel paint as per isi eqiv as per is 2062