a) Non-hazardous substances- All duct sections (with cladding if necessary) and accessories shall be properly and safely stacked and lifted up above the floor.- All duct sections (with cladding if necessary) and accessories shall be protected from sunlight and moisture.- All open ends of the duct sections shall be covered with plastic sheets.- All the storage areas and safe handling methods shall be approved by the Engineer / Safety Officer.b) Hazardous Substances/materialStorage, handling and disposal refer to MSDS and Health assessment attached in Appendix 6.