Features: AUTO WINDOW OPENER: As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating 7KG/15LB OPENING WEIGHT: Solar heat sensitive vent opener, stretch or shrink the vent while the temperature is changing.Maximum opening distance: 45 cm / 18 inches, suitable for vents weighing up to 7kg / 15lb NO DRILLING FOR INSTALLATION: Greenhouse window openers protects against wind gusts, clamped onto or screwed onto your greenhouse frame , no drilling needed. The Automatic vent opener is appropriated for most of the current garden greenhouses, easy to install PREMIUM ALUMINUM ALLOY: The window opener is made of high quality aluminum alloy, looks more lustrous. Durable and rust resistant in damp environments Long service life ADJUSTABLE TEMPERATURE: The temperature range is adjustable, Fully adjustable between 20 - 25 ° C (68 - 77 ° F), Do not use this opener anywhere the temperature will exceed 50° (122F) Specifications: Greenhouse Window Opener Kit Material: Aluminum Alloy Maximum window opening: 45cm / 18 inch Fully adjustable between 20 - 25 ° C (68 - 77 ° F) Maximum opening weight: 7kg/15lb Adjustable open temperature range: 20°- 25°/68°-77F Size: 38 x 9.5 x 5 cm / 14.96 x 3.74 x 1.97 inch (appr.) Package: 1 x Automatic Window Opener Kit Notes: Do not use this opener anywhere the temperature will exceed 50° (122F). Please ensure your greenhouse window can be opened freely by at least 45cm (18"). Do not apply excessive loads by locking or covering window. Do not dismantle the cylinder. The opener CANNOT stop by manual AUTO WINDOW OPENER: As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating 7KG/15LB OPENING WEIGHT: Solar heat sensitive vent opener, stretch or shrink the vent while the temperature is changing.Maximum opening distance: 45 cm / 18 inches, suitable for vents weighing up to 7kg / 15lb NO DRILLING FOR INSTALLATION: Greenhouse window openers protects against wind gusts, clamped onto or screwed onto your greenhouse frame , no drilling needed. The Automatic vent opener is appropriated for most of the current garden greenhouses, easy to install PREMIUM ALUMINUM ALLOY: The window opener is made of high quality aluminum alloy, looks more lustrous. Durable and rust resistant in damp environments Long service life ADJUSTABLE TEMPERATURE: The temperature range is adjustable, Fully adjustable between 20 - 25 ° C (68 - 77 ° F), Do not use this opener anywhere the temperature will exceed 50° (122F)