supply installation of bellow ducts set - 01 set consisting of 01 no of supply air bellow 02 nos of fresh bellows and 02 nos of return air bellow ducts. the bellow shall meet the technical requirement as per rdso specification no. rdso/pe/spec/ac/0197-2020 (rev.0) and drawing no. icf/sk3-7-6-072 alt a type- i