Extra Roof Window Type:Automatic Handcrafted wrought iron arbor for

SKU: 76271631220

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Extra Roof Window Type:Automatic Handcrafted wrought iron arbor forAdd more natural ventilation to your greenhouse with extra roof windows manual and automatic openers available. Automatic window openers The black tube is filled with special paraffin oil, which expands when the temperature reaches 72 degrees 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! Manual spindle opener A manual opener that works like a large

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