The Automatic Vent Opener was made to automatically control the temperature and humidity levels and offer additional ventilation when needed, making gardening easier. As the air within the greenhouse warms, the vent steadily opens to allow the right amount of ventilation in to the greenhouse and closes when the temperature cools. The vent arm was designed with a metal cylinder that contains wax which expands when heated to push a piston, which raises the windowpane, as the atmosphere gets warmer, then contracts since it cools, closing with the usage of a spring and resetting the piston. All you need to do is definitely to install it on your own roof vent window and it immediately starts operating. The Automatic Vent Opener works without the use of electricity and is compatible with all Palram greenhouse versions only. The solar driven Vent Opener will begin to open as temperatures inside your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs quickly and easily and will provide care-free ventilation.
Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works during the day and maintain a constant interior climate, something extremely hard to achieve 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 every our glazed season extenders since it dramatically enhances plant growth.
The hydraulic cylinder includes a 1 year warranty. The average lifetime of the cylinder is definitely 5-10 years, even though some can last up to 20 years.
Screw directly into polycarbonate panels, wooden, or metal frames. The Standard Vent Opener can open up a hinged screen or vent Greenhouse Vent Opener weighing 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 yearly, this will help extend the duration of the hydraulic cylinder. Avoid solid grease, as dirt particles “glues” easily onto the piston rod and will harm the rubber. Also don’t forget to unlock the vent in the winter if departing the vent openers set up. Even a weak winter sunlight can warmth the hydraulic cylinder sufficiently to make 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 strength. 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 allows vent to be completely opened for access to the interior.