These streamers show what happens when the EnviroZone Air Entrance - Air Door system is properly applied to your building. The Interior streamers on the left show that the interior air will not escape through the opening but rather rolled back into the store. The center streamer shows the recirculating laminar wall of air as it leaves the plenum and enters into the specially designed flooring . The exterior streamers on the right shows the exterior air not being able to enter into the building. These three zones are very important in keeping out unwanted infiltration.