Automatic Vent Opener - Standard

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.

Requires no batteries or electricity.

It can be adjusted to start opening between 60-77°F. Fully open at 86-90°F. Fully closed at 55°F.

Strongly recommended for all our glazed season extenders because it dramatically improves plant growth.

The hydraulic cylinder comes with a 1 year warranty. The average lifetime of the cylinder is 5-10 years, although some can last up to 20 years.

Replacement cylinders are available.