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 surroundings within the greenhouse warms, the vent steadily opens to allow the correct amount of air flow into the greenhouse and closes when the temperature cools. The vent arm was made with a metal cylinder that contains wax which expands when heated to press a piston, which raises the windowpane, as the atmosphere gets warmer, then contracts as it cools, closing with the use 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 instantly starts working. The Automatic Vent Opener works without the use of electricity and works with with all Palram greenhouse versions only. The solar powered Vent Opener will start to open as temps inside your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs efficiently and can 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 impossible to accomplish 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 Greenhouse Vent Opener growth.
The hydraulic cylinder includes a 1 year warranty. The common duration 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 windows or vent weighing as much as 32 lb. For larger panes use the stronger Gigavent with all metallic structure, to lift up to 65 lbs.
Note from the manufacturer: Recommended to lubricate the piston rod annual, this can help extend the duration of the hydraulic cylinder. Don’t use solid grease, as dust particles “glues” quickly onto the piston rod and will damage the rubber. Also don’t forget to unlock the vent in the wintertime if leaving the vent openers set up. Even a weak winter sunlight can temperature the hydraulic cylinder sufficiently to create 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-run 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.
