The Automatic Vent Opener was Greenhouse Vent Opener designed to automatically control the temperature and humidity amounts and provide additional ventilation when needed, making 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 designed with a steel cylinder that contains wax which expands when heated to push a piston, which raises the windows, as the surroundings 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 window and it automatically starts operating. The Automatic Vent Opener functions without the use of electricity and works with with all Palram greenhouse versions only. The solar driven Vent Opener will start to open as temperatures inside 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-delicate device that automatically opens and closes coldframe lids, greenhouse windows and actually skylights. Works throughout the day and maintain a continuous interior climate, something impossible to accomplish by manual adjustments.

Requires 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 most our glazed season extenders since it dramatically enhances plant growth.
The hydraulic cylinder includes a 1 year warranty. The average duration of the cylinder is 5-10 years, although some can last up to 20 years.

Screw directly into polycarbonate panels, wooden, or metal frames. THE TYPICAL Vent Opener can open up a hinged screen or vent weighing just as much as 32 lb. For larger panes use the more powerful Gigavent with all steel structure, to lift up to 65 lbs.

Note from the manufacturer: Recommended to lubricate the piston rod annual, this will help extend the duration of the hydraulic cylinder. Don’t use solid grease, as dust particles “glues” easily onto the piston rod and can harm the rubber. Also don’t forget to unlock the vent in the wintertime if departing the vent openers set up. A good weak winter sun can heat 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 may be the only solar-operate control with a quick-release mounting bracket. Just grasp the “clutch” arm and squeeze for easy detachment. This allows vent to be fully opened for access to the interior.