In case of places with large openings where there are major wind loads, the speed doors Grand Pass are the best choice thanks to its strength and a precise speed operation.
The resistance of each element of this fast action door is a key factor for its good operation, for this reason the vertical guides are made of galvanized steel and equipped with a series of internal reinforcements. The mobile curtain is made up by a series of panels formed by a double wall of laminated trevira canvas that, along with the extruded aluminium reinforcements, are the basis to withstand the high pressures. By varying the arrangement and the number of these elements, it is possible to increase wind resistance.
For very long voids, where large vehicles have to come through, it is possible to form sets of individual fold up speed doors with central guides which could be removable or retractable. This means that, once all doors forming the set are opened, the guides are removed, manually or automatically, freeing the maximum width passage. Once the vehicle has come through, the guides return to place and the doors will operate individually again. In these particular cases, the measures and characteristics must be determined through a technical study.