About This

• Automatically Regulate Greenhouse Ventilation: Opens and closes greenhouse windows automatically as temperatures rise and fall, allowing fresh airflow without daily adjustment; great for times when you are away and cannot monitor heat buildup
• Respond to Temperature: Temperature-sensitive cylinder activates window movement between 61-77℉ (16-25℃) and reaches full opening around 86℉ (30℃) depending on load and installation; requires no wiring, batteries, or manual operation
• Support Controlled Window Opening Range: Designed to open vent or roof windows up to 18 in; suitable for outward-opening greenhouse windows weighing up to 15.4 lb; controlled movement helps prevent sudden drops or slamming during operation
• Robust Anti-Rust Galvanized Sheet: Made from galvanized sheet for corrosion resistance in humid greenhouse environments; supports repeated opening cycles throughout the growing season; suitable for long-term use
• Versatile Use: Suitable for greenhouse roofs, hothouses, and sunrooms that require passive ventilation; helps release excess heat during warm days; requires proper installation and seasonal handling as outlined in instructions