Make sure that the door, the frame, and associated hardware are able to withstand all the forces that occur in the application.Large, flat door surfaces are vulnerable to deformation by wind. The door is usually strong enough to withstand the force of strong winds, but slamming caused by wind may damage the door, the frame, or the building structure. Select and install the door to limit slamming forces. This means that the door should be held firmly while it is in any position.In some cases, the closing and opening forces of the operator may be strong enough to deform the door.
You can avoid this problem by the way you install the operator linkage. See Measure 6.2.3 for details. Some types of doors, especially bi-fold doors, are subjected to large gravity loads that deform the doors when they are opened. Manufacturers of bi-fold doors offer additional bracing as an option. The bracing consists of horizontal trusses installed at the bottoms of the two panels. The trusses may be installed on the inner or outer sides of the door.Conventional doors generally are not designed to resist impact, as from vehicles. If the application involves a risk of impact, consider supplementing the primary exterior doors with an inner door that is designed to tolerate impact. See Measures 6.2.4 ff for these doors.