The Automatic Vent Opener was made to automatically control the temperature and humidity amounts and offer additional ventilation when needed, making gardening easier. As the atmosphere inside the greenhouse warms, the vent gradually opens to allow the right amount of air flow into 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 drive a piston, which raises the screen, as the air gets warmer, then contracts since it cools, closing with the use of a spring and resetting the piston. All you have to to do is usually to install it on your roof vent home window and it immediately starts working. The Automatic Vent Opener works without the utilization of electricity and is compatible with all Palram greenhouse versions only. The solar powered Vent Opener will start to open as temps inside your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs efficiently and will provide care-free ventilation.
Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and also skylights. Works Automatic Greenhouse Vent throughout the day and maintain a continuous interior climate, something not possible to attain by manual adjustments.
Requires simply no batteries or electricity.
It could be adjusted to start opening between 60-77°F. Fully open at 86-90°F. Fully closed at 55°F.
Strongly recommended 
for almost all our glazed season extenders since it dramatically enhances plant growth.
The hydraulic cylinder has a 1 year warranty. The common duration of the cylinder is usually 5-10 years, although some can last up to twenty years.
Screw directly into polycarbonate panels, wooden, or metal frames. The Standard Vent Opener can open up a hinged windows or vent weighing as much as 32 lb. For bigger panes use the more powerful Gigavent with all metallic building, to lift up to 65 lbs.
Note from the manufacturer: Recommended to lubricate the piston rod annual, this can help extend the duration of the hydraulic cylinder. Avoid solid grease, as dirt particles “glues” very easily onto the piston rod and may harm the rubber. Also do not forget to unlock the vent in the wintertime if departing the vent openers set up. A good weak winter sunlight can high temperature the hydraulic cylinder sufficiently to make it start pressing the piston rod outwards.
This solar vent control will open and close vents, in your solar gem greenhouse. It features two closing springs for extra strength. The solar vent opener is the only solar-operate control with a quick-release mounting bracket. Simply grasp the “clutch” arm and squeeze for easy detachment. This allows vent to be completely opened for usage of the interior.