Notes Choice of site is very important. Incinerators must be connected to an effi cient fl ue. Therefore an exterior wall may be preferable consisting of non-combustible material capable of supporting the unit. For convenience of loading, site close as possible to the source of waste. For sanitary towel disposal they should be installed in a toilet. Units may be used for disposal of small surgical dressings etc. in which case they may be installed in clinics or other similar locations. Incinerators can also be used for the destruction of legal and confi dential documents.