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Janssens Automatic Roof Window Opener

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Janssens Automatic Roof Window Opener

In stock (can be backordered)

$79.00

In stock (can be backordered)

Product Description:

For Royal or Junior Victorian Greenhouses: the black tube is filled with special paraffin oil - which expands when the temperature reached around 72º and the piston will push the window open up to about 14". When temperature falls a heavy spring pulls the window closed. No electricity needed!

Specifications:

  • Fully automatic - no electricity needed!
  • Opens to approx 14"
  • Black color

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