Air sterilisers; Electric air deodorizers; Filtering units for water filtering; Filters and filtering devices for air and gas conditioning; Filters for air conditioning; Filters for fluids, namely, for water and area-water solutions; Interior environment control system for commercial buildings, namely, heaters, ventilators and humidifiers all sold as a unit; Purification installations for sewage; Rainwater purification installations; Separators for the cleaning and purification of air; Separa...