Air conditioning equipment and components, ventilation equipment and components, purification equipment and components, environmental protection equipment and components, electromechanical equipment, machinery equipment, water tanks, cooling towers, fans, processing, sales, and installation of aluminum alloy products; valves, steel, insulation boards, pipes and pipe fittings, accessories for fire protection equipment, glass fiber reinforced plastic products, metal products (excluding precious metals) sales and installation; civil air defense engineering construction; and online sales of the above goods. (As may be required by laws and regulations, the company's business operation is subject to approval by the relevant department of administration.)