Janssens | Automatic Opener for Push Open Side Window or Roof Window Deck greenhouses The design differences include the

The design differences include the ability to accommodate large numbers of people (students) and allow them to become a part of the growing process

Permit requirements vary by city and county

What sizes are available

Support Style: Hanging chains connect to the roof for leveling

High-quality Bitumen roof shingles (90% pre-assembled)

Janssens | Automatic Opener for Push Open Side Window or Roof Window Deck greenhouses The design differences include theThe 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