The Automatic 
Vent Opener was designed to automatically control the temperature and humidity amounts and provide additional ventilation when needed, making gardening easier. As the air flow in the greenhouse warms, the vent steadily opens to enable the right amount of ventilation into the greenhouse and closes when the temperature cools. The vent arm was made with a steel cylinder that contains wax which expands when heated to push a piston, which raises the window, as the air flow gets warmer, then agreements as it cools, closing with the use of a spring and resetting the piston. All you need to do can be to install it on your own roof vent windows and it automatically starts operating. The Automatic Vent Opener Automatic Greenhouse Vent functions without the use of electricity and is compatible with all Palram greenhouse models only. The solar driven Vent Opener will start to open as temps within your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs quickly and easily and can provide care-free ventilation.
Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something extremely hard to attain by manual adjustments.
Requires no batteries or electricity.
It could be adjusted to begin opening between 60-77°F. Fully open up at 86-90°F. Fully closed at 55°F.
Strongly recommended for most our glazed season extenders since it dramatically enhances plant growth.
The hydraulic cylinder includes a 1 year warranty. The average duration of the cylinder is usually 5-10 years, although some can last up to 20 years.
Screw straight into polycarbonate panels, wood, or metal frames. THE TYPICAL Vent Opener can open up a hinged windows or vent weighing just as much as 32 lb. For bigger panes use the more powerful Gigavent with all metallic building, to lift up to 65 lbs.
