Mammoth Group, headquartered in Minnesota USA,was established in 1935
and is one of the subsidiaries of Nortek USA with an annual turnover of RMB20
billion. Nortek Group is the flagship company in the USA construction products
industry,the main business covers building materials, building equipment and
building product system integration. Mammoth Group owns eight brand series of
air conditioning, setting up research and development(R&D) ,and production
bases in the USA, UK and Canad...