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Develop dual-functions product to replace the current double-hung window insufficient airtightness, and ventilation problem on the market.
It has simple and symmetrical shape and eliminating extra visual lines.
When panels opened, the relative movement of the inner and outer air allows the air to circulate naturally.
The product’s performance designs are: to outdoor “air and water tight” and indoor “energy-saving ventilation”. In response to the increasing of global warming, we developed dual-functions product to replace the current double-hung window insufficient airtightness, and ventilation problem on the market.
The core value of the product lies in, whether it meets the potential needs of consumers, constantly in-depth exploring, simulate the using situation and propose the demand complete.
This product is easy and safe to operate, and does not require complicated instructions. With simple and symmetrical shape, eliminating extra visual lines, and showing the consistency

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