The Automatic Vent Opener was made to automatically control the temperature and humidity levels and offer additional ventilation when needed, making gardening easier. As the air flow inside the Greenhouse Vent Opener greenhouse warms, the vent steadily opens to enable the correct amount of ventilation in to the greenhouse and closes when the temperature cools. The vent arm was designed with a metallic cylinder that contains wax 
which expands when heated to force a piston, which raises the home window, as the air flow gets warmer, then contracts as it cools, closing with the utilization of a springtime and resetting the piston. All you have to to do is certainly to install it on your own roof vent home window and it automatically starts functioning. The Automatic Vent Opener functions without the use of electricity and is compatible with all Palram greenhouse models only. The solar run Vent Opener will start to open as temps inside your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs quickly and easily and will provide care-free ventilation.
Ingenious temperature-delicate device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something not possible to attain by manual adjustments.
Requires simply no batteries or electricity.
It could be adjusted to begin opening between 60-77°F. Fully open at 86-90°F. Fully closed at 55°F.
Strongly recommended for all our glazed season extenders because it dramatically improves plant growth.
The hydraulic cylinder comes with a 1 year warranty. The common duration of the cylinder is 5-10 years, although some can last up to twenty years.
Screw straight into polycarbonate panels, wood, or metal frames. THE TYPICAL Vent Opener can open up a hinged windowpane or vent weighing as much as 32 lb. For bigger panes use the stronger Gigavent with all metal building, to lift up to 65 lbs.