Ventilation for Greenhouses
Automatic greenhouse window opener – Univent®
This unique window opener is a very versatile opener. Capable of opening windows, doors and cold frames
Automatic window opener – Thermovent®
The cost effective window opener in aluminium-zinc coated steel.
Automatic window opener – Ventomax®
In spite of the opener’s simplicity, the design allows you to adjust the temperature where the opener begins to react to the surrounding temperature.
Automatic window opener – Sesam Spiro®
Is manufactured in stainless steel for the ultimate lifetime and keeps the hydraulic cylinder inside the greenhouse no matter if the window is open or closed.
Automatic greenhouse window opener – Optivent®
The piston rod is completely sealed off in an aluminium enclosure. This makes this window opener extremely applicable for dusty environments.
Automatic window opener – Sesam Liberty®
The opener can replace all existing both manual and automatic operated louver openers.
Automatic window opener – Megavent®
Is a strong and powerful opener able to lift wholly 70 % more than our window openers in the small range and has a large and powerful spring that will make sure that the opener is able to close even large windows in a strong wind.
Automatic window opener – Megavent Storm®
With a built-in damper for handling the window in strong winds.
Automatic window opener – Gigavent®
The most powerful window opener on the market. Handles large windows in strong wind.
Our renowned hydraulic cylinders from the small range window openers.
Hydraulic cylinders – THERMACT
These special hydraulic cylinders belongs to a group of products we call Thermact.
The 9 Best Automatic Vent Openers
Automatic vent openers are solutions to get ventilation in your greenhouse. Which can be used for windows, cold frames, louvres and sliding doors.
J. Orbesen Teknik ApS has been manufacturing automatic greenhouse vent openers for all kinds of greenhouses since 1981 i.e. more than 30 years. The core technology in the opener is the hydraulic cylinder that contains a plant-based wax. The special designed cylinder containing this wax, works as the greenhouse window openers thermostat, thus there is no need for electrical power supply