[Greenhouse window opener automatically opens and closes greenhouse windows to maintain optimal growing temperatures and prevent the greenhouse from overheating.] The vent opener can be closed manually, is easy to install, and fits most aluminum frame greenhouses. [Adjustable Temperature Range] The temperature range can be adjusted between 15 and 25°C by rotating the cylinder, with a maximum opening of approximately 30°C/86°F (depending on adjustment and load). [HIGH-QUALITY CONSTRUCTION] Window opener made of durable, rust-resistant iron, painted for long-lasting use. [15-pound load capacity] Allows you to lift 7 kg with a standard opener. Specifications: Material: Aluminum, Stainless Steel Color: Black Opening start temperature: 15-25°C (60-77°F) Full opening temperature: 30℃/86℉ Maximum opening distance: 45cm/17.71inch Load capacity: 7KG/15lb Cylinder length: 33.8cm/13.3inch Package size: 37.5*9.8*4.5cm/14.76*3.85*1.77inch Package weight: 439g/0.96lb Package list: 1 * Automatic vent opener 1 * Cylinder 1 * Kit 1 * Manual (English) Notes: Do not heat above 50°C (122°F). Do not disassemble the cylinder. Do not expose to excessive load by locking or covering windows.