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 within the 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 designed with a steel cylinder that contains wax which expands when heated to drive a piston, which raises the windowpane, as the surroundings gets Automatic Greenhouse Vent warmer, then contracts since it cools, closing with the use of a springtime and resetting the piston. All you need to do can be to install it on your roof vent windows 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 begin to open as temperature ranges inside 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-delicate device that automatically opens and closes coldframe lids, greenhouse windows and also skylights. Works throughout the day and maintain a constant interior climate, something extremely hard to attain by manual adjustments.

Requires no batteries or electricity.
It could be adjusted to start opening between 60-77°F. Fully open up at 86-90°F. Fully closed at 55°F.
Strongly recommended for every our glazed season extenders since it dramatically increases plant growth.
The hydraulic cylinder includes a 1 year warranty. The common duration of the cylinder is 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 screen or vent weighing just as much as 32 lb. For bigger panes use the stronger Gigavent with all metal structure, to lift up to 65 lbs.

Note from the maker: 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 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 warmth 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 may be the only solar-driven control with a quick-release mounting bracket. Simply grasp the “clutch” arm and squeeze for easy detachment. This allows vent to be fully opened for access to the interior.