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Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something impossible to achieve by manual adjustments.
Replacement cylinders are available.
Screw directly into polycarbonate panels, wood, or metal frames. Do you have lighter loads to lift? Use the Standard Vent Opener to easily open windows and vents weighing as much as 32 lbs.
Note from the manufacturer: It is not necessary to remove the cylinders during the winter. Recommended to lubricate the piston rod yearly, this will help extend the lifetime of the hydraulic cylinder. Don't use solid grease, as dust particles "glues" easily onto the piston rod and can damage the rubber. Also do not forget to unlock the vent in the winter if leaving the vent openers installed. Even a even a weak winter sun can heat the hydraulic cylinder sufficiently to make it start pushing the piston rod outwards.