Apparatus and instruments for use in the purification, separation and sterilization of liquids and gases used in the biotechnology, pharmaceutical, medical, biopharmaceutical and food and beverage industries; Cooking tunnels; Dampers, namely, control devices used in air ducts to regulate the flow of air; Fabric air dispersion ducts for distributing and dispensing air as part of a HVAC system; Holding furnaces and melting furnaces for industrial use; Interior environment control system for commercial buildings, namely, heaters, ventilators and humidifiers all sold as a unit; Luminous tubes for lighting; Purification installations for sewage; Roasting spits for cooking ovens; Tools, components and supplies for use in making signs, namely, fluorescent, HID, LED and incandescent bulbs, lamps and fixtures