Alton | Automatic Louvered Window Opener gable roof insulated building The twin-wall polycarbonate acts as

The twin-wall polycarbonate acts as a double plane window keeping the cooler air in during warm months and insulating the greenhouse from cold air in the wintertime

and practical features that improve everyday usability

Simply filter and replace oil

8mm twin-wall polycarbonate end walls

Warranty: 10 Years Limited warranty

Alton | Automatic Louvered Window Opener gable roof insulated building The twin-wall polycarbonate acts asLouver windows help the ventilation of a greenhouse. Adding an Alton Automatic Louver Opener will help regulate the airflow automatically when temperature changes. Automatic attachment for a Louvre vent, fits most louvres. Its fully adjustable to open over a range of temperatures between 59 77 degrees F. Some drilling is required to fit. Please note that an auto louvre CANNOT fit a louver which is directly left of an a frame when you look at it