EarthCare Greenhouse Auto Vent Openers

The perfect automatic greenhouse vent, window, and roof opener system. Allows for optimum ventilation and air circulation within the greenhouse structure. The EarthCare Universal Auto Roof Vent Opener can be used with most Aluminum Greenhouse Roof Vents. Opens and Closes the Roof Vents by the temperature which can be adjusted. Auto Opener has oil inside the cylinder which expands and contracts the rod to open and close.