
Greenhouse Vent Opener Aluminum Structure Automatic Window Opener for Farm Greenhouse. Power-Free Automatic Operation: Realizes constant temperature growth without batteries or electricity using double spring structure. Temperature Sensing Adjustment: Accurately senses temperature changes to automatically adjust window opening amplitude. 5-Year Warranty Coverage: Comprehensive warranty protection for all mechanical defects and operational issues. Multi-Color Options Available: Available in silver, black, blue, yellow, and red to match various greenhouse styles. Customization Options: Supports full customization, minor customization, and design-based customization. Alloy-Reinforced Design: Features anti-deformation design for enhanced durability and structural stability. Fast Lead Time: Standard production lead time within 15 workdays for both peak and off-peak seasons. Low MOQ Requirement: Minimum order quantity starts from just 1 piece for flexible purchasing.