High-speed productivity door has a self supporting, corrosion resistant powder coated steel frame. Perfect for exterior areas where wind ratings up to 110mph are required -- an excellent alternative to rigid steel rolling doors. These unique doors are also used in interior applications where high air pressure exists or insulation for temperature or sound is required. The Trekking Star 2 has an average speed of 48" per second which helps maintain separation of areas and reduces energy consumption. The unique vertical folding design uses straps to pull the curtain from the floor up without rolling it around a drum. This leaves only soft, flexible curtain folds exposed to impacts rather than rigid bottom bars like other high speed doors. High speed vertical stacking fabric door, for clear openings up to 20' by 20'. Typical uses are warehousing, manufacturing and distribution centers and anywhere higher wind requirements exist.