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 in the Automatic Greenhouse Vent 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 made with a metallic cylinder that contains wax which expands when heated to press a piston, which raises the windowpane, as the atmosphere gets warmer, then contracts as it cools, closing with the utilization of a springtime and resetting the piston. All you need to do is usually to install it on your own roof vent home window and it instantly starts operating. The Automatic Vent Opener functions without the usage of electricity and is compatible with all Palram greenhouse versions only. The solar run Vent Opener will begin to open as temperature ranges inside your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs efficiently and can provide care-free ventilation.
Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and actually skylights. Works during the day and maintain a constant interior climate, something impossible to attain by manual adjustments.
Requires no batteries or electricity.
It can be adjusted to start opening between 60-77°F. Fully open up at 86-90°F. Fully closed at 55°F.
Strongly recommended for all our glazed season extenders because it dramatically boosts plant growth.
The hydraulic cylinder has a 1 year warranty. The average lifetime of the cylinder can be 5-10 years, even though some can last up 
to twenty years.
Screw straight into polycarbonate panels, wood, or metal frames. The Standard Vent Opener can open up a hinged windows or vent weighing as much as 32 lb. For larger panes use the stronger Gigavent with all steel building, to lift up to 65 lbs.
Note from the manufacturer: Suggested to lubricate the piston rod yearly, this can help extend the lifetime of the hydraulic cylinder. Avoid solid grease, as dust particles “glues” easily onto the piston rod and can harm the rubber. Also do not forget to unlock the vent in the winter if leaving the vent openers installed. A good weak winter sunlight can high temperature the hydraulic cylinder sufficiently to create 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-driven control with a quick-release mounting bracket. Just grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be completely opened for usage of the interior.