Allows thermostatic ventilation control through the roof windows of your greenhouse. Two solar-powered models: the Ventomax, our basic model and the Univent, which is spring-loaded for easy opening and closing.
For use with basic, coldframes, and mini greenhouses.
Have owned a univent for over 10 years. It still works great and has been working in a heated greenhouse in MN for over 10 years. I would advise to keep the... read complete review...