The Automatic Vent Opener was made 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 gradually opens to enable the right Automatic Greenhouse Vent amount of air flow into the greenhouse and closes when the temperature cools. The vent arm was made with a metal cylinder that contains wax which expands when heated to push a piston, which raises the windowpane, as the surroundings gets warmer, then contracts since it cools, closing with the use of a spring and resetting the piston. All you need to do is to install it on your own roof vent window and it instantly starts operating. The Automatic Vent Opener works 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 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 even skylights. Works throughout the day and maintain a continuous interior climate, something unattainable to accomplish by manual adjustments.
Requires 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 comes with a 1 year warranty. The average duration of the 
cylinder is usually 5-10 years, even though some can last up to twenty years.
Screw straight into polycarbonate panels, wooden, or metal frames. The Standard Vent Opener can open a hinged home window or vent weighing just as much as 32 lb. For larger panes use the more powerful Gigavent with all steel construction, to lift up to 65 lbs.
Note from the manufacturer: Recommended to lubricate the piston rod annual, this will help extend the lifetime of the hydraulic cylinder. Don’t use solid grease, as dirt particles “glues” easily onto the piston rod and can damage 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 temperature the hydraulic cylinder sufficiently to create 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 power. The solar vent opener is the only solar-powered control with a quick-release mounting bracket. Just grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be fully opened for usage of the interior.