window opener (heavy duty)
window opener for greenhouses (heavy duty model)
With this window opener the greenhouse is ventilated automatically.
A pump, filled with oil, reacts very sensitively to temperature changes.
He expands and shrinks depending on the temperature, so the window opens and closes automatically.
This window opener uses two tension springs. As a result, he has much more power to allow to keep the window. Ideal when a strong wind throw.
He is also extremely suitable for greenhouses polycarbonate that weigh less than glass.