Important NOTICE:Do not use this opener anywhere the temperature will exceed 50 degree (122F).

This is a replacement CYLINDER only.

Non Electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.

Temperature range :It will be close at the greenhouse temperature less than 15 degree. It will be open at the greenhouse temperature more than 25 degree .

【Greenhouse Automatic Vent Opener】-- As the temperature changes,This auto thermo for window will automatically open and close your garden greenhouse vent to maintains the best growing temperature and prevents your greenhouse from overheating.

【Environmental friendly】-- Non electric, uses solar energy,open or close the greenhouse window as temperature rises or drops. This solar heat sensitive auto vent opener can lift up to 15 lbs. The cylinder closes well before deep freezing and opens again without problem.

【Warm Tips】-- Do not use this automatic roof vent Opener lifts anywhere the temperature will exceed .