Greenhouse Automatic Vent Opener (Silver Double Spring2PCS)

- Easy Setup with Video: Step by step video guide, easy calibration, includes 2 long screws for metal frames - Dual Spring 15 lbs Thrust: Powerful dual spring design, effortlessly opens and closes heavy vents windows - High Strength Aluminum Alloy: Made of strong aluminum alloy, superior durability for stable, long term use - Solar Powered Automatic: No electricity needed, heat activated, prevents overheating freezing automatically - Universal Fit for Greenhouses: Fits most greenhouse types, auto regulates temperature, functions as a smart gardening helper - Heat Activated Operation: Opens vents when temperature rises and closes them when temperature drops, working continuously without manual intervention - Complete Vent Kit: Includes 2 automatic greenhouse window openers with dual spring mechanism, providing comprehensive ventilation control for your greenhouse

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