5491 Components (12) 5497 Cleaning, repairing and renovating existing, floors, access floors and integral ducting (7) Cutting out, cleaning, repairing and renovating existing, floors, access floors and integral ducting 5498 Alteration work; demolishing and reconstructing, floors, access floors and integral (0) Demolishing and reconstructing, floors, access floors and integral ducting as part of general demolition, reconstruction, alterations and additions