The Automatic Vent Opener was designed to automatically control the temperature and humidity amounts and offer additional ventilation when needed, making gardening easier. As the Greenhouse Vent Opener surroundings within the greenhouse warms, the vent steadily opens to enable the correct 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 press a piston, which raises the windows, as the air gets warmer, then contracts as it cools, closing with the use of a spring and resetting the piston. All you need to do is usually to install it on your own roof vent windows and it immediately starts functioning. The Automatic Vent Opener operates without the use of electricity and works with with all Palram greenhouse models only. The solar run 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 not possible to achieve 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 almost all our glazed season extenders since it dramatically boosts plant growth.
The hydraulic cylinder includes a 1 year warranty. The average duration of the cylinder is certainly 5-10 years, although some can last up to twenty years.
Screw directly into polycarbonate panels, wood, or metal frames. The Standard Vent Opener can open up a 
hinged window or vent weighing as much as 32 lb. For larger panes use the stronger Gigavent with all metallic building, to lift up to 65 lbs.
Note from the manufacturer: Suggested to lubricate the piston rod yearly, this will help extend the duration of the hydraulic cylinder. Avoid solid grease, as dust particles "glues" very easily onto the piston rod and can damage the rubber. Also don't forget to unlock the vent in the wintertime if departing the vent openers installed. A good weak winter sun 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 may be the only solar-run 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.