Air humidifiers; Air humidifying apparatus; Air humidifying installations; De-humidifiers; Electric humidifiers; Humidifiers; Humidifiers (other than for medical use); Humidifiers for central heating radiators; Humidifying apparatus, other than for medical use; Humidifying machines, other than for medical use; Installations for de-humidifying; Installations for humidifying; Room humidifiers (apparatus); Room humidifiers that contain water and are placed on central heating radiators