The Weather Breaker 200 by General Doors Corporation is one of the most energy efficient doors in the industry. With an R-value of 18.5, and a section thickness of 2″, this door offers ultimate insulation and decades of reliable performance. Section design includes a thermal break to limit conductivity of heat and cold, two EPDM bulb seals between sections to prevent air passage, and a U-shaped flexible weather-strip with continuous retainer across the bottom of the door.