The Automatic Vent Opener was made to automatically control the temperature and humidity levels and provide additional ventilation when needed, making gardening easier. As the air flow inside the greenhouse warms, the vent gradually opens to enable the correct amount of ventilation in to the greenhouse and closes when the temperature cools. The vent arm was designed with a metallic cylinder containing wax which expands when heated to press a piston, which raises the window, as the atmosphere gets warmer, then contracts since it cools, closing with the usage of a spring and resetting the piston. All you have to to do is certainly to install it on your own roof vent windows and it automatically starts working. The Automatic Vent Opener operates without the use of electricity and works with 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 will 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 extremely hard to accomplish by manual adjustments.

Requires no batteries or electricity.
It can be adjusted to start 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 because it dramatically boosts plant Automatic Greenhouse Vent growth.
The hydraulic cylinder comes with a 1 year warranty. The common duration of the cylinder is certainly 5-10 years, although some can last up to twenty years.

Screw straight into polycarbonate panels, wood, or metal frames. The Standard Vent Opener can open up a hinged windowpane or vent weighing just as much as 32 lb. For larger panes use the more powerful Gigavent with all metallic construction, to lift up to 65 lbs.