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 air flow in the greenhouse warms, the vent gradually opens to enable the right amount of ventilation in to the greenhouse and closes when the temperature cools. The vent arm was made with a steel cylinder that contains wax which expands when heated to force a piston, which raises the screen, as the air gets warmer, then contracts since it cools, closing with the use of a springtime and resetting the piston. All you need to do is definitely to install it on your roof vent window and it automatically starts functioning. The Automatic Vent Opener functions without the usage of electricity and is compatible with all Palram greenhouse models only. The solar driven Vent Opener will begin to open as temps within your greenhouse reach 68 degrees F with full-open at 80 degrees. It installs efficiently and will provide care-free ventilation.
Ingenious temperature-delicate device that automatically opens and closes coldframe lids, greenhouse windows and also skylights. Works throughout the day and maintain a continuous interior climate, something not possible to attain by manual adjustments.

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

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

Note from the maker: Recommended to lubricate the piston rod yearly, this will help extend the duration of the hydraulic cylinder. Don’t use solid grease, as dirt particles “glues” very easily onto the piston rod and may damage the rubber. Also do not forget to unlock the vent in the wintertime if departing the vent openers set up. Even a 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 is the only solar-run control with a quick-release mounting bracket. Simply grasp the “clutch” arm and squeeze for easy detachment. This allows vent to be fully opened for access to the interior.