The Automatic Vent Opener was designed to automatically control the temperature and humidity levels and provide additional ventilation when needed, making gardening easier. As the atmosphere within the greenhouse warms, the vent steadily opens to allow the correct amount of ventilation into the greenhouse and closes when the temperature cools. The vent arm was designed with a steel cylinder containing wax which expands when heated to drive a piston, which raises the home window, as the surroundings gets warmer, then contracts since it cools, closing with the usage of a spring and resetting the piston. All you have to to do is to install it on your own roof vent windowpane and it automatically starts operating. The Automatic Vent Opener operates without the usage of electricity and works with with all Palram greenhouse models only. The solar run Vent Opener will start to open as temperature ranges within your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs Greenhouse Vent Opener 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 constant interior climate, something difficult to accomplish by manual adjustments.
Requires simply no batteries or electricity.
It can be adjusted to begin opening between 60-77°F. Fully open up at 86-90°F. Fully closed at 55°F.
Strongly recommended for all our glazed season extenders because it dramatically improves plant growth.
The hydraulic cylinder includes a 1 year warranty. The common duration of the cylinder is definitely 5-10 years, even though some can last up to 20 years.
Screw straight into polycarbonate panels, wooden, or metal frames. THE TYPICAL Vent Opener can open up a hinged window or vent weighing just as much as 32 lb. For larger panes use the stronger Gigavent with all steel structure, to lift up to 65 lbs.
Note from the manufacturer: Suggested to lubricate the piston rod yearly, this will help extend the duration of the hydraulic cylinder. Don’t use solid grease, as dust particles “glues” very easily onto the piston rod and can harm the rubber. Also do not forget to unlock the vent in the winter if departing the vent openers installed. A good weak winter sun can high temperature 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. Simply grasp the “clutch” arm and squeeze for easy detachment. This allows vent to be fully opened for usage of the interior.