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Air handlers; Fans for air conditioning apparatus; Filters for air conditioning; Humidifiers; Humidifiers for household purposes; Humidifiers for household use; Industrial air purifiers; Industrial humidifiers; Industrial-water purifying apparatus; Interior environment control system for commercial buildings, namely, heaters, ventilators and humidifiers all sold as a unit; Sewage purification installations; Sprinkler heads for irrigation sprinklers; Water purification and filtration apparatus