automatische raamopener dubbele veer Man certified by Control Union Certifications

certified by Control Union Certifications

insulating roof: twin-wall polycarbonate sheets retain heat in cold conditions

It also comes neatly presented in an open gift box

een naadloze palm en met een lange cuff

automatische raamopener dubbele veer Man certified by Control Union CertificationsThe automatic roof window opener with double spring regulates the ventilation of your greenhouse window fully automatically, without you having to keep checking it yourself. The system works with a cylinder filled with special wax that reacts to temperature: when it gets warmer in the greenhouse, the window opens; when it cools down, the window closes again. This keeps the climate in your greenhouse better balanced, even when you are not there. It is