The Automatic Vent Opener was made to automatically control the temperature and humidity amounts and provide Automatic Greenhouse Vent additional ventilation when needed, making gardening easier. As the atmosphere inside the greenhouse warms, the vent steadily opens to allow the correct amount of ventilation into the greenhouse and closes when 
the temperature cools. The vent arm was designed with a metal cylinder that contains wax which expands when heated to press a piston, which raises the screen, 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 definitely to install it on your own roof vent screen and it automatically starts operating. The Automatic Vent Opener operates without the use of electricity and is compatible with all Palram greenhouse versions only. The solar driven 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 can provide care-free ventilation.
Ingenious temperature-delicate device that automatically opens and closes coldframe lids, greenhouse windows and actually skylights. Works during the day and maintain a constant interior climate, something difficult to accomplish by manual adjustments.
Requires no batteries or electricity.
It can 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 since it dramatically improves plant growth.
The hydraulic cylinder has a 1 year warranty. The average lifetime 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 home window or vent weighing just 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 maker: Suggested to lubricate the piston rod yearly, this can help extend the lifetime of the hydraulic cylinder. Don’t use solid grease, as dirt particles “glues” very easily onto the piston rod and will damage the rubber. Also don’t forget to unlock the vent in the winter 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-driven control with a quick-release mounting bracket. Simply grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be completely opened for access to the interior.