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 flow within the greenhouse warms, the vent steadily opens to enable 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 Greenhouse Vent Opener heated to push a piston, which raises the window, as the atmosphere gets warmer, then agreements as it cools, closing with the utilization of a springtime and resetting the piston. All you need to do is certainly to install it on your roof vent windows and it instantly starts working. The Automatic Vent Opener works without the usage of electricity and is compatible with all Palram greenhouse models only. The solar driven Vent Opener will start to open as temperatures within 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 also skylights. Works throughout the day and maintain a continuous interior climate, something unattainable 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 every our glazed season extenders because it dramatically increases plant growth.
The hydraulic cylinder comes with a 1 year warranty. The average lifetime of the cylinder is definitely 5-10 years, although 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 windowpane or vent weighing as much as 32 lb. For bigger panes use the more powerful Gigavent with all metal structure, to lift up to 65 lbs.
Note from the maker: Suggested to lubricate the piston rod annual, this will help extend the lifetime of the hydraulic cylinder. Avoid solid grease, as dirt particles “glues” very easily onto the piston rod and may damage the rubber. Also don’t forget to unlock the vent in the winter if leaving the vent openers set up. A good weak winter sun can warmth the hydraulic cylinder sufficiently to create 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 power. 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 usage of the interior.