The Automatic Vent Opener was designed to automatically control the temperature and humidity amounts and provide additional ventilation when needed, making gardening easier. As the surroundings inside the greenhouse warms, the vent gradually opens to allow the correct amount of air flow into the greenhouse and closes when the temperature cools. The vent arm was made with a metallic cylinder containing wax which expands when heated to drive a piston, which raises the home window, as the atmosphere gets warmer, then contracts as it cools, closing with the use of a spring and resetting the piston. All you have to to do is to install it on your roof vent windowpane and it immediately starts functioning. The Automatic Vent Opener operates without the use of electricity and is compatible with all Palram greenhouse versions only. The solar powered Vent Opener will start to open as temperature ranges inside 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-delicate device that automatically opens and closes coldframe lids, greenhouse windows and also skylights. Works during the day and maintain a continuous interior Greenhouse Vent Opener climate, something extremely hard to accomplish by manual adjustments.

Requires simply 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 almost all our glazed season extenders since it dramatically boosts plant growth.
The hydraulic cylinder comes with a 1 year warranty. The common duration of the cylinder is usually 5-10 years, even though some can last up to twenty years.

Screw directly into polycarbonate panels, wooden, or metal frames. THE TYPICAL 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 metal building, to lift up to 65 lbs.