Exaco Royal Victorian Automatic Louvre Opener Window Agricultural Greenhouses Comes in both dark green

Comes in both dark green and black

Exaco Royal Victorian Spindle Opener

it opens at around 72°F

Works with Royal Victorian Roof Windows

Quick-release “arm” which allows the opener to be disconnected in adverse weather conditions

Exaco Royal Victorian Automatic Louvre Opener Window Agricultural Greenhouses Comes in both dark greenExaco Royal Victorian Automatic Louvre Opener Window Automatic Opener for Louvre Window for Royal or Junior Victorian Greenhouses: the black tube is filled with special parafine oil which expands when the temperature reached around 72 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"