Automatic Vent Opener Standard Automatic Roof Vent Opener Solar Heat Sensitive Greenhouse Autovent Opener Standard-Lifts 15LBs for Hothouse Cold Frame Gardening Tools No Power Needed.

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Suitable for Most Greenhouses：The maximum load-bearing capacity of the glass of the ventilation window does not exceed 15lb.
Suitable for Most Greenhouses：The maximum load-bearing capacity of the glass of the ventilation window does not exceed 15lb.
Working Condition：The maximum height of the open window is about 45 cm (18 inches).
Automatic Opening/ClosingUses Solar energy only, no power required.
Excellent Quality：Stainless steel galvanized sheet, double spring design, automatic temperature adjustment 15-25°.
Tips：Note: Do not apply excessive loads by locking or covering window.The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50°.

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