The Automatic Vent Opener was designed to automatically control the temperature and humidity levels 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 in to the greenhouse and closes when the temperature cools. The vent arm was designed with a metal cylinder containing wax which expands when heated to push a piston, which raises 
the windowpane, as the surroundings gets warmer, then agreements as it cools, closing with the usage of a spring and resetting the piston. All you need to do is to install it on your roof vent windowpane and it instantly starts working. The Automatic Vent Opener operates without the use of electricity and works with with all Palram greenhouse models only. The solar driven Vent Opener will begin to open as temperatures 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 actually skylights. Works throughout the day and maintain a constant interior climate, something impossible to accomplish by manual adjustments.
Requires simply no batteries or electricity.
It can be adjusted to start 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 average duration of the cylinder is 5-10 years, although some can last up to 20 years.
Screw directly into polycarbonate panels, wood, or metal frames. The Standard Vent Opener can open a hinged window or vent weighing as much as 32 lb. For bigger panes use the stronger Gigavent with all metallic construction, 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 winter if leaving the vent openers set up. A good weak winter sunlight can temperature the hydraulic cylinder sufficiently to make it start pushing 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 Automatic Greenhouse Vent 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.
