Janssens | Automatic Opener for Push Open Side Window or Roof Window estimateend-80 It helps maintain a stable

It helps maintain a stable growing environment without electricity or manual adjustment

and beginner-friendly setup

Perfect for a countertop

Enhances your outdoor space

Includes six roller hooks spool with 25m twine

Janssens | Automatic Opener for Push Open Side Window or Roof Window estimateend-80 It helps maintain a stableThe Janssens Automatic Opener for Push Open or Roof Window is an optional addition to your Push Open or Roof window in your Janssens greenhouse. The black tube is filled with special paraffin oil which expands when the temperature reaches around 72 F and the piston will push the window open. When temperature falls a heavy spring pulls the window closed. No electricity needed! WARRANTY 15 Year Limited Warranty