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Grandio Automatic Window Opener - World of Greenhouses

Grandio Automatic Window Opener

  • $ 79.00

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Automatically opens and closes the roof vent/window or the louver window when temperature changes. The opener has a metal cylinder containing a mineral which expands when heated. This pushes a piston that opens the vent. As the temperature cools, the mineral shrinks and a spring closes the vent and resets the piston. The opening and closing of the vent is gradual allowing just the right amount of air flow for cooling.

Customer Reviews

Based on 2 reviews Write a review

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