Guangzhou Huang Jia Mechanical And Electrical Equipment Co., Ltd under Royal Service Group(RS), including Royal Service Industries Corp. and Royal Service Suppliers Inc. The RS industry(RSI) in China is our product manufacturing and Asia base. The factory facility operates a complete R&D center, and modern equipped testing center. Royal Service Supplies (RSS) is a newly incorporated company opened to support the supply of quality goods for the Construction / HVAC market in North America. Our current business chain reaches across the pacific into Asia and North American countries. Our business model assures a supported end user product purchase. With business, engineering, manufacturing experience and final quality assurance. RSS can support your products requirements. Various divisions within RSS will support your purchasing requests from standard existing products or source for a original design or equipment manufacture supplying on demand. Our specialty products are (H.A.V.C) components, such as example ventilation end caps, supply and return diffusers, control cables...etc. Our supporting offices are in Guangzhou China, Los Angeles USA, and Settle USA, all with logistic centers.