About This

• Automatic Vent Control: Opens and closes greenhouse windows as temperatures rise and fall, so fresh airflow keeps moving without daily adjustment; helpful when you are away and cannot keep checking heat buildup
• Responds to Temperature: Temperature sensitive cylinder moves the window between 61-77℉ (16-25℃) and reaches full opening around 86℉ (30℃), depending on load and installation; no wiring, batteries, or manual operation
• Controlled 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; steady movement helps avoid sudden drops or slamming during operation
• Galvanized Sheet Build: Made from galvanized sheet for use in humid greenhouse conditions; supports repeated opening cycles through the growing season; suited to long term greenhouse setup and everyday ventilation needs
• Versatile Use: Suitable for greenhouse roofs, hothouses, and sunrooms that need passive ventilation; helps release excess heat during warm days; follow the instructions for proper installation and seasonal handling