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 in the greenhouse warms, the vent gradually opens to enable the right Greenhouse Vent Opener amount of ventilation into the greenhouse and closes when the temperature cools. The vent arm was designed with a metallic cylinder containing wax which expands when heated to drive a piston, which raises the window, as the atmosphere gets warmer, then contracts since it cools, closing with the use of a springtime and resetting the piston. All you have to to do is certainly 
to install it on your roof vent windowpane and it instantly starts functioning. The Automatic Vent Opener functions without the usage of electricity and works with with all Palram greenhouse models only. The solar driven Vent Opener will start to open as temps within 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 also skylights. Works during the day and maintain a continuous interior climate, something not possible to attain by manual adjustments.
Requires simply 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 because it dramatically boosts plant growth.
The hydraulic cylinder has a 1 year warranty. The average duration of the cylinder is certainly 5-10 years, although some can last up to twenty years.
Screw straight into polycarbonate panels, wooden, or metal frames. The Standard Vent Opener can open a hinged windowpane 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 maker: Recommended to lubricate the piston rod annual, this will help extend the lifetime of the hydraulic cylinder. Don’t use solid grease, as dust particles “glues” quickly onto the piston rod and will damage 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 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-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.