ShelterLogic AutoVent Automatic Shelter Vent Kit A bimetallic spring that is heat sensitive will open the vent at 74 degrees, fully open at 104 degrees; and will close automatically when the internal temperature cools down Promotes air circulation and temperature regulation by reducing the humidity and moisture buildup in your fabric garage or shelter Easy to install with 2-sided plastic pop rivets Fits with any fabric covered Instant Garage or storage shelter Vents are screened to keep out insects and debris Reduce humidity and moisture buildup in your fabric garage or shelter. Easy installation with 2-sided plastic pop rivets. Vents are screened to keep out insects and debris. The perfect quick and affordable ventilation air circulation solution for your fully enclosed shelter. A heat sensitive bimetallic spring begins to open the vent at 74F. Vent is fully open at 104F. Vent closes as temperature cools down