Airwoods, founded in 2007, is the leading global provider of innovative HVAC products and building air quality solution to the commercial and industrial markets. Our commitment is to provide our customers with the best products and services at affordable price and create better living environment. We are air heat exchanger supplier, Air Heat Exchanger Factory. The thin walled double pipe counterflow is a heat exchanger that uses two concentric tubes in a counterflow arrangement to transfer thermal energy from one fluid stream to another. The heat exchanger efficiency up to 80%.