The Automatic Vent Greenhouse Vent Opener Opener was designed to automatically control the temperature and humidity amounts and provide additional ventilation when needed, making gardening easier. As the air flow inside the greenhouse warms, the vent steadily opens to enable the correct amount of air flow in to the greenhouse and closes when the temperature cools. The vent arm was designed 
with a steel cylinder containing wax which expands when heated to push a piston, which raises the windowpane, as the surroundings gets warmer, then agreements as it cools, closing with the utilization of a spring and resetting the piston. All you have to to do is to install it on your roof vent screen and it automatically starts working. The Automatic Vent Opener functions without the utilization of electricity and works with with all Palram greenhouse versions only. The solar driven Vent Opener will begin to open as temps 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 continuous interior climate, something extremely hard 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 increases plant growth.
The hydraulic cylinder comes with a 1 year warranty. The common duration of the cylinder is 5-10 years, although some can last up to twenty years.
Screw directly into polycarbonate panels, wooden, or metal frames. THE TYPICAL Vent Opener can open up a hinged window or vent weighing as much as 32 lb. For larger panes use the stronger Gigavent with all metallic building, to lift up to 65 lbs.
Note from the manufacturer: Recommended to lubricate the piston rod yearly, this will help extend the duration of the hydraulic cylinder. Don’t use solid grease, as dirt particles “glues” quickly onto the piston rod and can damage the rubber. Also don’t forget to unlock the vent in the wintertime if departing the vent openers set up. A good weak winter sunlight can temperature 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-powered control with a quick-release mounting bracket. Simply grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be completely opened for usage of the interior.