The Automatic Vent Opener was designed to automatically control the temperature and humidity levels and offer additional ventilation when needed, making gardening easier. As the air within the greenhouse warms, the vent gradually opens to enable the right amount of air flow into the greenhouse and Greenhouse Vent Opener closes when the temperature cools. The vent arm was made with a steel cylinder that contains wax which expands when heated 
to force a piston, which raises the windows, as the atmosphere gets warmer, then agreements since it cools, closing with the use of a spring and resetting the piston. All you need to do is certainly to install it on your own roof vent windowpane and it immediately starts functioning. The Automatic Vent Opener operates without the use of electricity and works with with all Palram greenhouse versions only. The solar driven Vent Opener will begin to open as temperature ranges inside 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 actually skylights. Works throughout the day and maintain a continuous interior climate, something extremely hard to attain by manual adjustments.
Requires simply no batteries or electricity.
It can be adjusted to begin opening between 60-77°F. Fully open up at 86-90°F. Fully closed at 55°F.
Strongly recommended for almost all our glazed season extenders since it dramatically increases plant growth.
The hydraulic cylinder has a 1 year warranty. The common lifetime of the cylinder is usually 5-10 years, even though some can last up to 20 years.
Screw directly into polycarbonate panels, wooden, or metal frames. THE TYPICAL Vent Opener can open up a hinged windowpane or vent weighing just as much as 32 lb. For bigger panes use the stronger Gigavent with all metallic construction, to lift up to 65 lbs.