DuroSTEEL JANUS 4'x7' Mini Storage 650 Series Metal Roll-up Door Hardware DiRECT Minimizes the locking and reinforcement needed to strengthen the door to pass rigorous wind load testing. Locking device may be located on the curtain or the bottom bar. Fewer friction points and less additional weight results in a door that operates better and still yields greater strength than any other available to the self storage industry. Applicable opening sizes range form 3' wide through 10' wide, with maximum height being 12'. Doors may be installed on steel, concrete, or filled block jambs. Applicable opening sizes range form 3' wide through 10' wide, with maximum height being 12'. Doors may be installed on steel, concrete, or filled block jambs. All door sizes meet the wind load requirements of the interior and exterior zones for 100 mph SBC wind speed and 130 mph exposure B, ASCE 7 wind speed. Higher wind load ratings are available for certain sizes and can be determined on an individual basis