Tools & Supplies Greenhouse and Tunnel Supplies Vents and Vent Openers

Univent Automatic Vent and Window Opener

Product ID: 9034

Universal, for greenhouse and cold frame applications.

Temperature-responsive opener for greenhouse windows and traditional cold frames. Can be adjusted to open between 60°F/16°C and 77°F/25°C. Extends to 18", lifts up to 15 lb. Made from corrosion resistant materials including aluminum and stainless steel. Quick-disconnect mounting bracket is especially useful when mounted on cold frames. Also appropriate for roof and wall vents. Winter Storage: It is recommended that your Univent - or at least the cylinder - is removed from your greenhouse or cold frame for the winter. Store it in a dry place and do not forget to lubricate the piston rod before remounting in the spring. Also check that the piston rod moves smoothly.

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How It Works: Vent openers do not require electricity. The opener has a metal cylinder containing a mineral wax that expands when heated. This pushes a piston that opens the vent. As the temperature cools the wax contracts, and a spring closes the vent and resets the piston. The opening and closing of the vent is gradual, allowing just the right amount of air flow for cooling.

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