The Automatic Vent Opener was designed to automatically control the temperature and humidity amounts and offer additional ventilation when needed, making Greenhouse Vent Opener gardening easier. As the air inside the greenhouse warms, the vent gradually 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 metal cylinder containing wax which expands when heated to press a piston, which raises the windows, as the surroundings gets warmer, then agreements since it cools, closing with the use of a springtime and resetting the piston. All you have to to do can be to install it on your own roof vent windows and it immediately starts functioning. The Automatic Vent Opener operates without the use of electricity and works with with all Palram greenhouse versions only. The solar powered Vent Opener will begin 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 also skylights. Works during the day and maintain a 
constant interior climate, something difficult to attain 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 most our glazed season extenders since it dramatically enhances plant growth.
The hydraulic cylinder comes with a 1 year warranty. The average duration of the cylinder is usually 5-10 years, although some can last up to twenty years.
Screw straight into polycarbonate panels, wood, or metal frames. THE TYPICAL Vent Opener can open a hinged windowpane or vent weighing as much as 32 lb. For bigger panes use the stronger Gigavent with all metallic construction, to lift up to 65 lbs.
Note from the maker: Suggested to lubricate the piston rod annual, this can help extend the duration of the hydraulic cylinder. Avoid solid grease, as dirt particles “glues” easily onto the piston rod and will harm the rubber. Also do not forget to unlock the vent in the wintertime if departing the vent openers set up. Even a weak winter sunlight can warmth the hydraulic cylinder sufficiently to make 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-driven 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.