Automatic Window Opener, Aluminium Universal Auto Greenhouse Vent Opener Cylinder Replacement Temperature Sensor Automatic Opening Closing Louver Blind Window Opener for Home Office

???PREMIUM QUALITY??? The auto vent opener is made of high quality aluminium material, not easy to rust and durable in use. And, the spring and support bar provide additional protection against wind damage. The automatic vent opener is suitable for any blind window, easy to use. ???NO ELECTRICITY REQUIRED??? The automatic window opener has easy fitting by clamps or screws provided, no batteries or electricity required. And, the window opener automatically opens and closes as the temperature changes. Meanwhile, the automatic roof vent opener is universal, easy to install and use. ?? ?MAXIMUM OPENING??? Opening Force: 25kg / 55lb; Operation Area: Start at 17-25? (63-78?); Maximum Open: Full at 30-32? (86-90?); Closing Force: 15kg/ 33lb via heavy duty spring; Support Bar Length: Approx. 34cm / 13.4in; Spring Fixing Tool Size: Approx. 14 x 5 cm / 5.5 x 2 in. ?? ?PACKAGE LIST??? This package includes: 1 x Support Bar; 1 x Spring Fixing Tool; 4 x Slotted Screw; 2 x Small Cross Nail; 4 x TD Screws; 2 x Small Screw; 4 x Large Round Fixed Ring; 2 x Small Round Fixed Ring; 2 x Round Iron Ring; 1 x Instruction Manual. ?? ?100% SATISFACTION GUARANTEED??? If the automatic ventilation opener fails to make you satisfied let us know right away so we can send you a full purchase refund. If you have any question, please be free to contact with our customer service.