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 inside the greenhouse warms, the vent steadily opens to enable the correct amount of ventilation in to the greenhouse and closes when the temperature cools. The vent arm was made with a metal cylinder containing wax which expands when heated to press a piston, which raises the windows, as the air flow gets warmer, then contracts since it cools, closing with the utilization of a springtime and resetting the piston. All you have to to do is certainly to install it on your own roof vent screen and it automatically 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 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 even skylights. Works throughout the day and maintain a continuous interior climate, something not possible 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 almost all our glazed season extenders because it dramatically enhances plant growth.
The hydraulic cylinder includes a 1 year warranty. The average duration of the cylinder can be 5-10 
years, although some can last up to 20 years.
Screw directly into polycarbonate panels, wood, or metal frames. THE TYPICAL Vent Opener can open up a hinged windows 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.
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