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Univent Automatic Opener

Item Number: 4100

$52 

Keep your plants in their "comfort zone".This temperature-responsive automatic opener is specially designed to automatically open and close bifold covers on cold frames. Set it to open between 60°F and 77°F to keep the temperature inside the cold frame from overheating. 

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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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Flat Rate $12.50 to most destinations on the East Coast

Assembly and installation instructions included with unit.  Place opener in freezer for an hour or so before installation. Mount opener to front board of cold frame when opener is "closed".