Aluminum Wind-Bar Reinforced PVC Industrial High Speed Door For Outdoor Coastal Facilities Coastal and open-air facilities expose high speed doors to constant wind loads. Without reinforcement, a PVC curtain can flap, billow, and lose stability, straining the drive system and shortening service life. This Industrial High Speed Door is designed around one core selling point: reinforced PVC curtain with aluminum wind bars . Horizontal aluminum wind bars reinforce the curtain