The Automatic Vent Opener was made to automatically control the temperature and humidity amounts 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 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 screen, as the surroundings gets warmer, then contracts as it cools, closing with the usage of a springtime and resetting the piston. All you have to to do can be to install it on your own roof vent screen 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 driven Vent Opener will begin to open as temperature ranges 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 also skylights. Works during the day and maintain a continuous interior climate, something impossible to attain by manual adjustments.

Requires no batteries or electricity.
It could 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 because it dramatically enhances plant growth.
The hydraulic cylinder includes a 1 year warranty. The average lifetime of the cylinder is 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 windows or vent weighing just as much as 32 lb. For bigger panes use the stronger Gigavent with all metal building, to lift up to 65 lbs.

Note from the maker: Suggested to lubricate the piston rod annual, this will help extend the duration of the hydraulic cylinder. Avoid solid grease, as dirt particles “glues” easily onto the piston rod and can damage the Automatic Greenhouse Vent rubber. Also don’t forget to unlock the vent in the wintertime if leaving the vent openers installed. Even a weak winter sunlight can heat 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. Just grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be completely opened for usage of the interior.