Our eternal pursuits are the attitude of "regard the market, regard the custom, regard the science" and the theory of "quality the basic, trust the first and management the advanced" for Fresh Air System, HEAT EXCHANGER , Customized Function Modules , Rooftop Installation ,HRVs . Standing still today and searching into the long run, we sincerely welcome shoppers all around the globe to cooperate with us. The product will supply to all over the world, such as Europe, America, Australia,Singapore , Bogota ,Cancun , Puerto Rico .We set a strict quality control system. We have return and exchange policy, and you can exchange within 7 days after receive the wigs if it is in new station and we service repairing free for our products. Please feel free to contact us for further information if you have any questions. We are glad to work for every client.