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Homes often have small gaps between the living spaces and the attic. On windy winter days warmth can be sucked from your rooms, into the attic. It exhausts out through the turbine attic ventilator.

The Turbine Boss stops the winter heat loss. Its louvers' OPEN in summer 80 degrees Fahrenheit, and CLOSE in winter 40 degrees Fahrenheit. The louvers are driven by temperature. No batteries needed. Easily fits inside your new or old turbine ventilator. Just install it & forget it.

See it work before installing. Put in refrigerator. Louvers will close in 30-minutes.

• Packaging: Paperboard
• Manufacturer Guarantee: 25 years
• Origin: United States