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Ventech louvers & dampers inc Our products have been sold far to America, European and other parts of the world and have earned positive feedback from customers. With the increasing popularity among the customers and in the market, the brand awareness of our Ventech is enhanced accordingly. More and more customers are seeing our brand as the representative of high quality. We will do more R&D efforts to develop more such high-quality products to meet a wider market demand.diffuser valve,air duct valve,extract valve.