Greenhouse Accessories: Univent Spring and Hyrdraulic Automatic Vent Opener

With the Juliana automatic window openers, you can be sure of an even temperature in your greenhouse day and night. They allow thermostatic ventilation control through the roof windows of your greenhouse. Although two solar-powered models are available, DoItYourself.com only recommends the Univent, which is spring-loaded for a tight closure and allows more accurate thermostatic ventilation control through the roof windows of your greenhouse.

Replacement cylinders are available. The hydraulic cylinder is warranted for 12 months and has a normal life of 3 to 4 years, depending on atmospheric conditions.