Materials for fire protection A multi-story, steel-framed construction will likely require fire protection to fulfill Building Regulations standards for structural stability. The National Fire Protection Association (NFPA) recommends using class B mineral wool and class B glass fiber insulation for floors and walls respectively in combination with a noncombustible roof deck. The roof should be composed of an aluminum or steel deck with no surface treatment such as flame retardant chemicals. The NFPA also recommends installing fire-resistant doors and windows, which would contain any flames that do get through the wall cavity. Fire protection measures must be applied to all systems that are exposed to fire, including electrical wiring, plumbing, heating/cooling equipment, and office furniture. In addition, structures built without fire protection measures are more likely to burn down. Fire protection measures may include fire-rated materials used in the construction of buildings, rooms, or components; fire-retardant materials used to fill holes or other openings in walls or ceilings; and fire extinguishers available at multiple locations throughout the building. Heating, ventilation, and air conditioning (HVAC) systems play an important role in reducing injuries due to smoke exposure. Smoke can damage HVAC systems by causing motor failures, system component damage, or corrosion.