Automatic Ventilation opener – Ventilation in greenhouses

Automatic greenhouse window opener

  • Ventilation - Ventomax
Ventilation - Ventomax

As a reseller, it is important to know the product’s properties before launching the product on the market. The main element of all Orbesen Teknik’s products is that it is self-working ventilation opener which is handmade by Danish labour and ensures the correct temperature in your customer’s greenhouse. Which also means that your customer doesn’t have to think about open the window in their greenhouse.

Properties of the product

Ventomax® is offered to your customers who simply want to open their greenhouse window without extraordinary features. Application for:

  • Rooflight in greenhouse

Ventomax® is equipped with a spring, which allows the ventilation opener to be closed. It is possible for your customer, to adjust the temperature on the cylinder for opening the window if a previous or later opening between 17 °C and 30 °C is desired. Ventomax® on the cylinder can be purchased.

The opener is designed to be used all year. However, the ventilation opener must be ensured in the winter, if your customer is using a heat source inside the greenhouse or perhaps in stormy weather.

Electro galvanized steel
Windows weight
14 kg
Opening force
7 kg
Standard closing force (a)
0.5 kg
Temperature range, opening
17 – 25 ºC
Maximum window opening at
30 ºC
Maximum opening
45 cm
Anodized black

a) The weight of the window will assist the spring force in the closing, and should be added to the given closing force

Ventilation opener Ventomax® 

Above you see pictures of Ventomax®, which is made of electro galvanized steel and are “twin” with Thermovent® and Sesam Spiro®. The product is equipped with an opener and a cylinder, which has been designed to lift a 14 kg window.


The moving parts of the opener and cylinder must be lubricated with a light oil (olive oil) once a year.


2-year warranty for end-user and 3-year professional warranty are valid from the date of purchase.

Manual guide and installation video 

In the ventilation openers delivery, a manual guide is provided and Orbesen Teknik offer a free installation video with own logo for your company’s website.


Ventilation openers are delivered in styrofoam and closed with a cover, either Orbesen Teknik’s own cover or there is the possibility getting own cover. However there are some specific requirements.

If you want a collaboration, you can fill our the form at the top or send an email to

For Professionals/B2B
For Professionals/B2B


Please contact us

Phone: (+45) 59 65 17 17

Monday-Thursday: 8:00 am – 16:00 pm

Friday: 8:00 am – 14:00 pm