The Automatic Vent Opener was designed to automatically control the temperature and humidity amounts and offer additional ventilation when needed, making gardening easier. As the surroundings in the greenhouse warms, the vent gradually opens to allow the correct amount of air flow in to the greenhouse and Automatic Greenhouse Vent closes when the temperature cools. The vent arm was made with a metal cylinder that contains wax which expands when heated to force a piston, which raises the window, as the surroundings gets warmer, then agreements since 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 functioning. The Automatic Vent Opener operates without the utilization of electricity and is compatible with all Palram greenhouse versions only. The solar driven Vent Opener will begin to open as temperatures within your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs quickly and easily and can provide care-free ventilation.
Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something extremely hard to attain by manual adjustments.
Requires no batteries or electricity.
It could 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 has a 1 year warranty. The common duration of the cylinder is usually 5-10 years, although some 
can last up to twenty years.
Screw directly into polycarbonate panels, wood, or metal frames. The Standard 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 metallic structure, to lift up to 65 lbs.
Note from the manufacturer: Suggested to lubricate the piston rod yearly, this will help extend the lifetime of the hydraulic cylinder. Don’t use solid grease, as dust particles “glues” easily onto the piston rod and may damage the rubber. Also don’t forget to unlock the vent in the wintertime if leaving the vent openers installed. Even a weak winter sun can heat 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-run control with a quick-release mounting bracket. Just grasp the “clutch” arm and squeeze for easy detachment. This enables vent to be completely opened for usage of the interior.