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 air within the Greenhouse Vent Opener greenhouse warms, the vent steadily opens to allow the right amount of air flow in to the greenhouse and closes when the temperature cools. The vent arm was made with a metallic cylinder containing wax which expands when heated to push a piston, which raises the window, as the air flow gets warmer, then contracts since it cools, closing with the usage of a springtime and resetting the piston. All you have to to do can be to install it on your own roof vent screen and it automatically starts operating. The Automatic Vent Opener functions without the use of electricity and is compatible with all Palram greenhouse versions only. The solar run Vent Opener will begin to open as temperatures within your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs efficiently and can provide care-free ventilation.
Ingenious temperature-delicate device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something difficult to accomplish by manual adjustments.

Requires simply no batteries or electricity.
It can be adjusted to start opening between 60-77°F. Fully open at 86-90°F. Fully closed at 55°F.
Strongly recommended for all our glazed season extenders since it dramatically increases plant growth.
The hydraulic cylinder includes a 1 year warranty. The average lifetime of the cylinder is 5-10 years, even though some can last up to 20 years.

Screw straight into polycarbonate panels, wooden, or metal frames. The Standard Vent Opener can open up a hinged home window or vent weighing as much as 32 lb. For bigger panes use the stronger Gigavent with all steel construction, to lift up to 65 lbs.

Note from the maker: Recommended to lubricate the piston rod yearly, this can help extend the lifetime of the hydraulic cylinder. Avoid solid grease, as dust particles “glues” easily onto the piston rod and may harm the rubber. Also don’t forget to unlock the vent in the winter if leaving the vent openers installed. A good weak winter sun can warmth the hydraulic cylinder sufficiently to create 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 strength. The solar vent opener may be the only solar-driven 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.