Door Closers Konnwei

Description: Prevent greenhouse overheating. Ideal for your greenhouse window--opens and closes your greenhouse window. As the temperature changes automatically, maintains the best growing temperature more→and prevents your greenhouse from overheating. Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. Can be clamped onto or screwed onto your greenhouse frame. Important notice: Do not use this opener anywhere the temperature will exceed 50 degrees (122F) Please ensure your greenhouse window can be opened freely by at least 45cm (18 ) Do not apply excessive loads by locking or covering window Do not dismantle the cylinder The opener CANNOT stop by …