Thermovent LT Automatic Window Opener

Fully Autonomous Operation

The opener works without electricity, batteries, or wiring.

It operates using a hydraulic cylinder mechanism:

• when the temperature rises, the liquid inside the cylinder expands

• the piston pushes the vent open

• when the temperature drops, the liquid contracts

• the return spring automatically closes the window

This simple physical principle ensures reliable and maintenance-free operation.

Proven European Quality

The heart of the mechanism is an original hydraulic cylinder manufactured by the Danish company J. Orbesen Teknik Aps, known for its durability and reliability.

🇩🇰 Made in Denmark

Accurate Temperature Response

The system is designed so that the cylinder always remains inside the greenhouse, regardless of the vent position.
This ensures the opener reacts precisely to the actual internal temperature.

Adjustable Opening Temperature

You can easily adjust the temperature at which the vent begins to open within a range of +15°C to +25°C, allowing you to create the optimal climate for different crops.

Durable Corrosion-Resistant Materials

The housing and arms are made from high-strength steel with aluminum-zinc coating, providing excellent protection against corrosion in humid greenhouse environments.

Technical Specifications

Package Contents

The kit includes everything required for installation:

• hydraulic cylinder

• piston rod

• lever arms

• frame and vent mounting brackets

• return spring

• fixing clips

• mounting hardware

✅ A reliable, electricity-free solution that automatically ventilates your greenhouse and protects plants from overheating.