Roof Ventilation Window Opener Support A simple to install ventilation support designed for greenhouse roof windows. This opener provides stable, low maintenance operation and allows precise control of indoor air circulation to help maintain favorable growing conditions and regulate temperature and airflow. Key benefits Control indoor air circulation to improve plant health and reduce temperature stress. Stable and durable design for reliable operation with minimal intervention. Precise regulation of the environment to support consistent growing conditions. Suitable for hobby greenhouses as well as commercial and large scale operations. Helps improve planting efficiency and reduce operational costs by automating ventilation. Features Simple installation for quick mounting on roof windows. Efficient support for controlled opening and closing of ventilation windows. Designed to maintain stable ventilation and airflow with minimal adjustment. Built to support both small garden setups and larger agricultural greenhouses. Specifications Length: about 32 cm 12.6 inch Package includes 1 set Window Opener Support Use scenarios Small hobby greenhouse: Automate roof ventilation to maintain steady airflow and prevent overheating during warm days. Commercial greenhouse: Use multiple supports to regulate air circulation across larger spans and reduce manual labor. Garden polytunnel or nursery: Provide consistent ventilation for seedlings and potted plants to promote uniform growth. Notes Please allow 1 to 3 cm error due to manual measurement. Color may vary slightly from images due to differences between monitors.