2017 widely used greenhouse automatic window opener

2017 widely used greenhouse automatic window opener HX-T31 Series      Product Overviews   HX-T312-1 Double Spring Bracket            HX-T312 Single Spring Bracket         Product Description   Product Description:   Huixin window opener is an ideal way to provide extra ventilation for your greenhouse during hot weather. The temperature controlled cylinder activates the vent opener when the heat reaches a certain level, and closes the vent again when the temperature drops. In this way, the vent opener ensures your plants have sufficient airflow throughout the day. It is a universal fit, which means it is suitable for all aluminium frame greenhouses. Its aluminium & stainless steel construction means that it is durable and weather resistant.     Product Features:    • Temperature controlled sensor cylinder enables roof vents to be opened and closed at the appropriate time, ensuring sufficient airflow • Made from aluminium & stainless steel - durable and weather resistant • Fully adjustable to open between 15-25°C Start Open at 25°C (77°F); Star Close at 15°C (60°F) 
• Max open temperature: 38°C/100°F • Max open distance: 45cm/18'' • Perfect for windows or vents weight up to: 7kg/15lbs • Universal fit - suitable for any aluminium frame greenhouse • Mechanical system activated by heat - no batteries or electricity needed, which means no running costs • Automatic response to weather changes - controls the temperature without requiring your attention • Easy to install using detailed instructions included         Detailed Images     The core technology -- Hydraulic Cylinder The metal cylinder contains a plant-based wax, which can expand or shrink when temperature changes, so in this way, lead the spring open or close the louver window.                Packaging & Shipping  Standard Packing: Packing: 1pcs/white inner box, 50 boxes/ctn OEM: Inner box can do colour box with your own design Shipping: 7-30 working days after the payment     Inner box:  installation manual can print customer's own version with their language       standard white inner box. can also made colour box with your own design           Master carton:    Bulk purchase packing      Retail packing We have sufficient stock products through all the year For small quantity quickly purchase, please click here go to our AliExpress store.                Related Products  Automatic Louver Opener (specially open aluminium louver window automatically)          HX66 Series 6mm Polycarbonate Greenhouse