==Safety with good price tent experts ==competitive price ==implement military standard 1, The clear-span 20m2, The length of BT20 could be 20m, 25m 30m and +5m more. 3, Frame uses hard pressed extruded aluminium 6061 /T6(13HW). 4, The fabric is double PVC-coated polyester textile. It is high quality at waterproof, Flame retardant to DIN4102 B1, M2, UV resistant. 5, The maximum allowed wind speed ...