... , party, ceremony, exhibition etc.1, The clear-span of BT20 is 20m.2, The length of BT20 could be 20m, 25m, 30m and +5m more ... . 3, Frame uses hard pressed extruded aluminium 6061/T6(13HW). 4, The ... event, military solution, temporary warehouse and workshop. 8, Sizes available (the width of the big tent): 12m, 15m, 18m, 20m, 21m, 25m, 30m ...