This auto vent opener is polinater friendly.  You can mount it so the venting window opens out and the bees can catch the thermal draft out of your greenhouse and not pound against the film until they are exhausted. Auto vent opener uses solar warmth to open and cooling to close.  This cylinder can work both vertical and horizontal positions.  Maximum thrust 15#.  Adjustable screw thread dial for opening temperature control.  Works best in the vertical north or south positions but will work in the horizontal east or west positions with problems encountered below 28 degrees for extended periods. 

  • Item #: RGH 9002

Auto Vent Opener Multi Position

Price: $29.00
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