When installing bridge supports, if it's outdoors, a protective cover should be added to the upper layer. When installing devices with pre-drilled holes or adding air filters, the upper bridge supports should be protected. If the upper bridge support is narrower than the lower one, a protective cover should also be added to the lower bridge support. If bridge supports are installed in areas prone to damage from external factors, such as areas with dense machinery and equipment, protective covers should be added to safeguard the bridge supports from damage.