Product Description

Exaco Janssens Automatic Roof Window Opener

This is an amazing feature provided for Royal or Junior Victorian greenhouse owners who do not want to manually open their roof windows. 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 and Details for the Automatic Roof Window Opener

• Fully automatic - no electricity needed!
• Opens to approx 14"
• opens roof window automatically when it reaches 72º 
• Automatically closes when temperature drops.
• Please read instructions included with the Ventomax auto opener to fully understand the functioning and maintenance for these unique openers
• Black color

Installation

Installing the automatic opener requires 2 bolts to be inserted into the roof crossbar for the lower mount The upper mount will clamp onto the window profile (Shown to the right).