Univent Automatic Vent and Window Opener

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.