Douai is designed and manufactured using high-quality material and the latest techniques in compliance with industry standards. It is non-toxic, non-flammable and non-corrosive
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The design of Douai is never out of date. It is designed in accordance with the latest edition of ASHRAE Standard 15
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The design and material selection processes of Douai are strictly controlled. It is granted with certificates such as SGS, VDE, TUV, and UL
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Douai leads in design and technology. There is no tightness degradation caused by temperature variations, pressure cycling, and vibrations
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The manufacturing process of Douai is safe and reliable. It has zero Ozone layer depleting properties
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A rigorous quality control process ensures zero defects and consistent quality. It has been exported to USA, Italy, Germany, France, Poland, South Korea, etc